The sensible folks here already know this but because he's Autistic it needs to be repeated because some folks with preconceived biases and/or ignorance would assume otherwise:
Autism does not make a person perform a Nazi salute.
Autism does not excuse someone using a Nazi salute.
Autism and Nazis are oil and water. Nazis killed us during WWII eugenics programs. Fascism as a whole always ends up with varying degrees of ableism and discrimination against neuro-minorities.
We do not advocate for Elon's behavior and do not approve of the symbolism he has used.
Elon Musk has, despite being Autistic himself, spouted plenty of ableist rhetoric throughout the years. He has caused great harm to our image and community both up to this incident and with it.