Autism is considered primarily genetic and it's inheritable.

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.