Why does Autism Speaks Play Down the Paternal Age Issue in the Press and in Their Literature?

Are older parents really "slightly" higher risk to have autistic children? Especially older fathers as I have not been convinced that being an older mother without other risk factors raises the risk of autism.

One thing that does raise the risk of autism, is if you have an autoimmune disorder or you parents or your cousins, aunts, uncles, grandparents do.
Why is this fact not made public?