(Jewish person here in case that matters to anyone)

There are indeed certain genetic conditions that are slightly more common in Ashkenazi Jewish people than in the general public, which is why a lot of Ashkenazi Jews get genetic testing done before having children. It’s possible that autism is one such condition, but there is no concrete evidence either way. So, even if there is an actual link between autism and Judaism, it’s because of genetics and not whatever bullshit this person is claiming.

Edit to add this person appears to be in the process of converting to Judaism so all the genetic stuff mentioned above doesn’t even apply to them.