New research suggest it's something to do with the gut microbiome that may cause autism.

"Children with autism seem to have a distinctive and underdeveloped range and volume of gut bacteria (microbiome) that isn’t related to their diet, suggests a small study published online in the journal Gut.

They have significantly fewer bacteria linked to neurotransmitter activity and 5 species of bacteria that aren’t typically found in the guts of children without the condition, suggesting that there may be a characteristic microbial profile for autism, which may pave the way for treatment early on, say the researchers.

Apart from genetic factors, it has been suggested that the gut microbiome may have a part to play in autism spectrum disorders. And the evidence suggests that the pathway between gut bacteria and the central nervous system, referred to as the gut-brain axis, has a profound effect on social behaviours."
https://scitechdaily.com/new-research-finds-children-with-autism-have-a-distinctive-gut-microbiome/

With causation and effect hard to pin down I can't see how he can argue definitively it's the vaccines causing autism. There's so many variables at play like exposure living in high industrial areas, lead found in baby foods, people who eat spinach get something like seventy five times more aluminum over their lifetime from spinach than vaccines. So I think if he keeps pressing on with that issue it may come back to bite him.

It's appalling to watch them get away with censoring him like that, hopefully if this ever does get broke wide open they hold news organizations accountable for their actions. He should have known they'd be setting traps for him, moving forward he should make it clear he's focused on only one type of vaccine and that's the mRNA vaccines otherwise they will just keep setting him up.