I read the study and TBH it's more or less expected that a correlation would exist between increased NDD diagnoses and prescriptions common to pregnant women in regions with increased NDD diagnoses.

Being afforded better care during pregnancy should correlate with better attention (and diagnosis of conditions) to offspring.

If one were cynical one might say this was a good call by Andrea Baccarelli, the Dean of the Faculty, to commission a meta study looking for correlations between common treatments and NDD diagnoses in the current climate of funding going toward whomever can put forward a thread to follow in pursuit of autism.