I'll have to take your word for most of that, I know nothing about the incel culture beyond the surface level. From what I do know, it does make sense they could take a concept like that and use it for evil.
But I never said attractive people don't vote. I said people who think they're attractive don't vote. Being attractive isn't the same as being vain. And I don't think vain people vote; not absolutely, but I do think they are less likely to cast a ballot. Like I said earlier, voting turnout is abysmal on average for reasons that are amplified in a vain person's psychology.