So wait, this claim actually holds some water.
If the invest that Destroyer gave Fuji worked gave opposite results, then that means we should doubt Nat. But here's the catch, Fuji's biggest suspects when he town cleared Nat, were Typo, and Zara. So if scum were giving him an invest that gave the opposite result, I would assume that's because they thought he would investigate Typo which would give innocent or Zara which would give whatever. But Fuji pulling an unexpected invest on Nat, and getting innocent would have been outside the scum's prediction because the investigation wasn't tailored to Nat's alignment.
This means that either Nat is scum, or the gift was legit. I honestly believe the latter more than the former. And because I believe the latter, that must mean that Nat's invest on Zem should also be legit.
Meaning Nat and Zem should be cleared, and Destroyer gifted legit abilities.
I was listing out possibilities, Zem :(