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I feel like I'm missing something.
The book says that, for Ophydian Destroyers, one model is equipped with 2 Hyperphase Reap-Blades (S+2, AP-4, D3, no other rules on the weapon).
The model itself has the "Hyperphase Reap-Blades" rule, which is "Each time a model in this unit makes an attack with a hyperphase reap-blade, an unmodified hit roll of 6 scores 1 additional hit"

Is the fact that it has 2 reap-blades extraneous, since they're not like lightning claws or something and don't give an extra attack each or whatever? Or does it having two mean the rule quoted above kicks in twice each time it rolls a 6?

Fight phase rules under select weapon cover this situation.

You only pick one weapon to make any given attack, so you can not use both weapons on the same attack. (If you have 3 attacks and are armed with 2 weapons, you choose which weapon to use for any given attack, so you can go all 3 with 1 weapon, or 2 with one and one with the other).

The rules for the weapon under the abilities section, will tell you if you get extra attacks for multiples of that weapon.

For example Lightning claws say "If the bearer is equipped with two of this weapon, then when the bearer fights, it makes 1 additional attack using this profile." in the abilities section.

 DeathReaper wrote:
Fight phase rules under select weapon cover this situation.

You only pick one weapon to make any given attack, so you can not use both weapons on the same attack. (If you have 3 attacks and are armed with 2 weapons, you choose which weapon to use for any given attack, so you can go all 3 with 1 weapon, or 2 with one and one with the other).

The rules for the weapon under the abilities section, will tell you if you get extra attacks for multiples of that weapon.

For example Lightning claws say "If the bearer is equipped with two of this weapon, then when the bearer fights, it makes 1 additional attack using this profile." in the abilities section.

Right, which is why I'm confused by them getting 2 of the weapon. I know it doesn't give them extra attacks just by virtue of having 2 of them, and am trying to figure out what reason there might be for having 2. The only thing I could come up with is that the reap-blades rule on their datasheet kicks in twice. Or that there's literally no reason for them to have 2 of the weapon rather than 1.
I even considered that it might just be a stylistic choice. But the skorpekh destroyers only have the single reap-blade. So I'm at a loss.

Some craftworld exarchs (banshees?) could disable a CCW, so it could be defense against that, or future proofing for abilities like that.

It's an odd one - it might be because one of the Skorpekh Destroyers is armed with a single reap-blade and doesn't get the special rule?

 Nightbringer's Chosen wrote:

 DeathReaper wrote:
Fight phase rules under select weapon cover this situation.

You only pick one weapon to make any given attack, so you can not use both weapons on the same attack. (If you have 3 attacks and are armed with 2 weapons, you choose which weapon to use for any given attack, so you can go all 3 with 1 weapon, or 2 with one and one with the other).

The rules for the weapon under the abilities section, will tell you if you get extra attacks for multiples of that weapon.

For example Lightning claws say "If the bearer is equipped with two of this weapon, then when the bearer fights, it makes 1 additional attack using this profile." in the abilities section.

Right, which is why I'm confused by them getting 2 of the weapon. I know it doesn't give them extra attacks just by virtue of having 2 of them, and am trying to figure out what reason there might be for having 2. The only thing I could come up with is that the reap-blades rule on their datasheet kicks in twice. Or that there's literally no reason for them to have 2 of the weapon rather than 1.
I even considered that it might just be a stylistic choice. But the skorpekh destroyers only have the single reap-blade. So I'm at a loss.

the reap-blades rule on their datasheet can not kick in twice, as there is no rule saying that they do.

The reason they have 2 hyperphase reap-blades on their dataslate is because that is what GW printed on their dataslate.

As the others have said, having a second hyperphase reap-blade doesn't actually do anything, ruleswise.

My suspicion as to why they gave them two of them on the datasheet is simply because, well, the model has two of them. They have to replace the Hyperspace Threshers for every one in three models, which I assume take up two "slots" on the physical model, so to replace them they gave two hyperphase reap-blades to replace them.

In fairness, this does actually have a niche reason/application. If Jain Zar (From the Craftworlds codex, the Howling Banshee Phoenix Lord) uses her Disarming Strike ability, and passes, on an Ophydian Destroyer with 2 hyperphase reap-blades, it only disables one of the blades, and it can use the other. Mystery Solved!

It also likely helps visually tell the weapons apart from the single weapon. It might also be a throwback to an earlier version of the rules where having two instead of one made a difference which later got changed.

Bacon also identifies where having two weapons on the profile can have a net gain for a unit in a specific situations.

 DeathReaper wrote:
The reason they have 2 hyperphase reap-blades on their dataslate is because that is what GW printed on their dataslate.

I suppose I was unclear. I was not asking why it is on the sheet. Everything on the sheet is clearly there because GW printed it there, unless some mischievous nurgling snuck in and changed things before the final printing. What I was actually asking, which I thought would be evident, is "Why did GW print that on their datasheet?".

 Nightbringer's Chosen wrote:

 DeathReaper wrote:
The reason they have 2 hyperphase reap-blades on their dataslate is because that is what GW printed on their dataslate.

I suppose I was unclear. I was not asking why it is on the sheet. Everything on the sheet is clearly there because GW printed it there, unless some mischievous nurgling snuck in and changed things before the final printing. What I was actually asking, which I thought would be evident, is "Why did GW print that on their datasheet?".

No one but GW can answer that except GW. We can speculate, but we just wont ever know unless GW tells us.

So I assumed that having the pair of reap-blades is the reason that Ophydians have the special rule, since Skorpekh's with one reap-blade don't. If that's the case then it does make sense beyond looking cool - GW just did a poor job of explaining it