They don't even know what autism is. Genetics play a role, but most likely they simply affect the chances of developing autism. And really autism is a spectrum, so think like a clock. If the minute hand is between 10 and 2, it is autism, the rest isn't. So it is less a thing you "have" and more about being in a range from thing that ends up causing a snowball effect.
My kid is autistic. It is like there is a missing feedback channel that would cause a typical kid to modify there behavior. All that really translates to is a lower sensitivity to a specific feedback. Typical people will have a range, he is just very low on that range.
I don't want them to "cure autism" by erasing it, either. I'd rather they try to "cure autism" by improving on what it can help a human be capable of doing. That way, if we have a real-life "Butlerian Jihad" like from the lore of Dune, we have Mentats (human computers) to replace "thinking machines"(AI and computers).