One or more additional research groups...preferably ones affiliated with top medical schools...must reproduce these results for them to be accepted.
Autism has picked up over the decades. No explanation. One would have to look at lifestyle changes over time. To me it points to processed foods. Fast food is no help. Too many sex partners?
This. Can the research be independently replicated? One study is interesting. Multiple independent studies will show if this is true or not.
Modern science has an ongoing issue with replicating research.