Maybe its something in the environment or food or?
Back about 10 - 20 years ago I saw something that claimed that the area around “silicon valley” had above average autism rates. They chalked it up to the areas population who were very tech/analytically minded.
I worked with an officer whose son was profoundly autistic. He was very “quirky.” He was a great guy and a talented officer but lacked something in social skills. He seemed to realize it and worked around it.
SillyCon Valley has “at least its share” of (largely new) industrial contaminants. Indeed, there is an entire district of Palo Alto that is known for its underground chemical cocktail of industrial waste (known in the trade as MES, short for Methyl Ethyl Sh*t .. since there are so many compounds included in the stuff that ...some of the best-known corporations...used to just toss out or allow to soak into the ground, etc.).
And there was a neighborhood of San Jose that had a similar leakage of cancer-causing chemicals from a big-name semiconductor manufacturer.
Nowadays, we understand that these companies are being far more careful, .. thankfully.
Look up epigenetics.
If there is an environmental reason and it were epigenetic it would affect the parents generation a little but the kids a lot more.
If it were strictly genetic, the risk factors wouldn’t be living within 500ft of a major highway or having been born prematurely.