ASD has a heritability of around 80-90 percent (variance explained by genetics). That's about the same as human height. There are important environmental factors, but this is probably bullshit considering the source. You can tell when they don't mention the effect size (the increased probability of developing the disorder) which is probably very low.
Autism is a severe neurodevelopmental disorder and there are no easy answers. Trump and RFK Jr are liars and morons, and this preys on desperate parents trying to help their kids.