RFK Jr has long suggested that WiFi and cellular radio may be significant factor in autism (and ADHD, allergies, and obesity). I was expecting then that the big autism announcement would either be that or his old fallback of vaccines.
At least with Tylenol there is (if I correctly understood what I heard about this for the 2-3 minutes I had NPR on while driving to the AM/PM for a snack) there is a correlation between autism and use of Tylenol during pregnancy.
The discussion on NPR, which included a researcher who wrote a paper that the government is basing this on I believe, said that there is no evidence that there is causality here. Nearly everyone in the field thinks that it is far more likely that whatever is causing autism might also increase the likelihood of pain during pregnancy, and so the correlation with Tylenol is simply because those mothers turn to a pain reducing drug and Tylenol is the most commonly recommended drug for that.
Also, Trump managed to get through this without somehow finding a way to directly blame autism on the left/Democrats, so that too is way better than I expected.