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So I skimmed through forum posts going back into Feb 2021 and I didn't see this particular rules clarification addressed anywhere, so here goes:

I play Space Mary Sues against several local hobby friends, one of whom is a (new) Necron player, in a narrative crusade.
Said Necron player fielded a Skorpekh Lord equipped with the Necron crusade relic Transdimensional Shroud. As a Skorpekh Lord, he has access to the stratagem Whirling Onslaught. The Rules for these read as follows:

Transdimensional Shroud
Each time a ranged attack is made against the bearer, an unmodified wound roll of 1-3 for that attack fails, irrespective of any abilities that the weapon or the model making the attack may have.

Whirling Onslaught
Use this Stratagem in any phase, when a SKORPEKH DESTROYERS or SKORPEKH LORD unit from your army is selected as the target of an attack. Until the end of the phase, each time an attack is made against that unit, subtract l from that attack's wound roll.

Now, I didn't know these exact definitions at the time of play, so we basically had a Nec Lord that could only ever be wounded on 5+ in shooting. Mind you, I still cracked him (in shooting), but it felt punishingly difficult as a trait combo interaction and thus went digging, finding nothing, meaning one of two things:
a) we did everything right, the rules clearly state this as a legal combination, because it only negates wounding in shooting, not every kind of wound (which would still be super powerful)
b) we fethed up, because the rules clearly state that the interactions don't function the way we played them

Reading through the wording of the rules, I'm leaning towards b) , my reasoning being as follows:
Transdimensional Shroud specifically states unmodified wound rolls of 1-3 fail. Assuming a weapon of strength 7 or better vs. Skorpekh Lord Toughness of 6, I wound him on natural 4's.
Now Whirling Onslaught modifies wound rolls by -1, but because the rolled 4 becomes a modified 3, it should still wound him, as only unmodified rolls of 1-3 fail.

Opinions, prior experiences, errata or official clarifications all welcome. Derisive laughter at our blundering is also fine, but keep in mind, the Nec player is a newbie and the honest sort of person, so I'm not accusing them of wilfully undercutting me as their opponent.

Fire away!

Yes, unmodified means exactly that

 DornScorn wrote:
Reading through the wording of the rules, I'm leaning towards b) , my reasoning being as follows:
Transdimensional Shroud specifically states unmodified wound rolls of 1-3 fail. Assuming a weapon of strength 7 or better vs. Skorpekh Lord Toughness of 6, I wound him on natural 4's.
Now Whirling Onslaught modifies wound rolls by -1, but because the rolled 4 becomes a modified 3, it should still wound him, as only unmodified rolls of 1-3 fail./quote]This I s correct for the exact reasoning you gave.

Apply both rules.

Roll your Wound rolls. Discard results of 1-3.
Then apply modifiers to remaining dice, and see if they wound as normal.

Simples!