I think it stems from the fact that autism is one of the least attractive things a man can have and the strongest single factor linked to late life male virginity.
Ie.
Autistic men have the highest probability of being incel of all men. Keep in mind many of the nonvirgin autistic men would have had sex with a prostitute for example, and still despite this, 45% are adult virgins.
Certainly even among short men or ethnic men or ugly men (within reason) there is nowhere near a 45% adult virginity rate.
So when you have a trait that is so strongly linked to failure with women, maybe sub 8 law is correct. Ie. The only probable way from these numbers for a male autist to get a real relationship is to be extremely high functioning with their autism, very rich, or very good looking.
Whereas for an average NT white guy with a decent job, 5-6/10 is enough to get by with a few girls who might like you over your lifetime.