You should be more certain: RFK definitely doesn't know what autism is. He has a history of talking about autism which is full of errors and misinformation that indicate his understanding is full of unsafe assumptions and prejudices.It honestly makes me doubt that RFK knows what autism is
From the way he's talking about this project and his hiring of an anti-vaxx discredited scientists to take a major role running it, what RFK Jr. looks like doing is sending the NIH to find an answer he's already decided on. When the NIH cannot get the data to prove that answer, well...
...there is a high risk the NIH will simply write up a report to claim it has sort of found the answer RFK Jr. wanted, and/or that this answer will need to be investigated further therefore the US should waste huge sums of public money trying to find out.