He doesn't even know if he's on the spectrum because, at least as far as we know, he hasn't been evaluated. He just decided he has autism because he thinks it lets him get away with doing atrocious shit. As if autism made you an asshole.
Funny thing about that, I once did some investigation on the page he reposted it from, and they seem to be very against self-diagnosis, and put a great emphasis on the suffering of autistic people.