Or that Tylenol is able to aggravate a pathway that results in development of autism. This would move it from "Tylenol causes autism" to "maternal use of Tylenol may be a trigger for development of autism in utero". The latter statement would also require providing compelling that autism (or a condition currently indistinguishable from it) is either not genetic as currently suspected or is like schizophrenia in requiring both a genetic predisposition and a "trigger".

Now, that's quite a bit to have to prove and there's no way in hell RFK Jr of all people managed to figure it out in 6 fucking months. So yeah if China or the EU starts saying this maybe it's worth considering the possibility, otherwise it's just another unsubstantiated claim that unfortunately means pregnant people are going to be recommended it's not worth risking