Earlier quoted context omitted.
It seems that higher sensitivity to pain could be a very plausible cause. I believe there's studies showing lowered (and altered) pain tolerance with autism. Though I'd expect that if aspirin did have an affect that it'd change the prevalence or severity of autism in children having genes related to autism. There'd be a first order correction fornthe likelihood that aspirin is causitive by controlling for increased i…
Aspirin ???!! Its not mentioned in the OP. No one here mentioned it. WTF???!
Nevertheless, comparing the observed correlations of Tylenol with aspirin and ibuprofen would be the first thing to check. Seems unlikely to me that the OP's suggestion could be controlled for that way. I'll be curious if Kennedy's report checks those basic things.