If its not genetic, which autism isn't, then it has nothing to do with eugenics. People have the right to choose how they raise children, trying to dictate that is much more similar to eugenics imo
What we don't yet understand is the complex set of genetic interactions that result in ASD.
Here's one study: https://www.pnas.org/doi/10.1073/pnas.2215632120 but there are dozens if not hundreds more like this.
Your claim that ASD is not genetic is extraordinary and counter to the prevailing scientific understanding, and requires significant evidence to back up.