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In the Siege of Vraks codex it states the Mega bolter can fire twice if the tank remains stationary. However, the latest 7th edition says super heavy vehicles says they're always treated as if they had remained stationary, even it has moved. So can it move 12'' and still fire the Mega-volter twice as if it hadn't moved?

Additionally, the rule goes on to say that if the Vulcan fires twice it must do so at the same target. Is this true with the current super-heavy rules? It's not like it's a "heavy 2" gun but rather it's allowed to fire twice, should it be able to fire at two different targets despite this specific, yet somewhat outdated rule?

Vehicles have the Relentless special rule. Relentless doesn't allow a vehicle to count as stationary for firing a Mega-bolter twice. Therefore you must remain stationary in order to do so.

Also, the super heavy rules only cover individual weapons firing at different targets. It does not cover a single weapon firing twice. The rules for the Mega-bolter would stand as written.

Thanks for the clarification.

What about the 2nd interpretation, the Macharius Vulcan being able to fire the same weapon twice at different targets?

If the rule in the codex says it fires at same target, it supercedes the SHV rules in the BRB.

The rule isn't outdated, its a specific counter to the superheavy rules. SH have been able to shoot at whatever they want for a long time.