It wasn't commonly diagnosed during any of these people's lives, so you're not going to find conclusive evidence.
None of them were diagnosed (obviously not Newton).
So you're only going to find people arguing over straws.
What are you arguing?
They have Autism until proven otherwise?
About 0.5% of people were diagnosed with Autism before 1990: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4113600/
If we're making assumptions, statistically, we'd probably want to assume the other way.