It is not generally possible to diagnose the mental health of dead people. That hasn't stopped people taking guesses, but that has a lot of problems with it. This subreddit's most commonly asked question (for some strange reason) is 'Did people in [pre-modern time period] get PTSD?', and when that gets asked we like to refer people to this post about why that's not something we can truly know. Similar things apply to autism, as both are conditions discovered in the 20th century and have an unhelpfully nebulous load of symptoms that vary in severity.