

Correct me if I’m wrong but I think I read that it was neurological issues in general (not just autism specifically) that weakly correlated with tylenol usage.
But yes, the next question is what were they taking tylenol for? Fevers? Infections? Some type of illness? Some factor that itself might be what contributed to the neurological problems rather than the medicine they took to relieve their symptoms?
To over-simplify, it’s like saying tylenol causes headaches with no further study, because they found a correlation between taking tylenol and having headaches. Distinguish correlation and causation. Sometimes a correlation points to a cause, oftentimes it doesn’t.
Spanish wordplay: ¿Por qué está feliz la escoba? Porque siempre barriendo.
Translation: Why is the broom happy? Because it’s always sweeping (barriendo = sweeping, sounds like va riendo = goes around laughing)