I wouldn't say delusion if it was certain that they would get away with it, but again they're overplaying their hand, all this aggression just because the person acknowledged the historical existence of jewish slavers, this isn't some cringe neo nazi tossing slurs around and it's not even someone questioning the details of the holocaust, it's literally just "jewish people did some bad stuff in history too" and they're very publicly trying to not only ruin his life but coerce him into groveling for mercy, they done fucked up, the sympathy for them is about to evaporate into thin air