Nah, as an autistic person who works with many autistic people (I am a support worker), no. Autistic people are able to miss things, mistake social cues, and so on, but blaming autism for a Nazi salute is absolutely bullshit. Not to mention that he has done tonnes of other stuff which is in line with a Nazi salute and this is just the last in a long line of behaviours, and his family history etc, yeah, not autism, just Nazi shit.