That is a retrospective meta study, which leads to lots of speculation, but little actual proof of causation.
>> The researchers noted that while steps should be taken to limit acetaminophen use, the drug is important for treating maternal fever and pain, which can also harm children.
also:
>> Baccarelli noted in the “competing interests” section of the paper that he has served as an expert witness for a plaintiff in a case involving potential links between acetominophen use during pregnancy and neurodevelopmental disorders.
Huh, but digging in a little more does show some stronger studies... hmmmm...