Not an alt, this is my main account. Sorry to make you think this is a shitpost, it really wasn't meant to be.
An illness is defined as: a condition of being unhealthy in your body or mind. Being LGBT is not unhealthy.
While this is a troll post, that'd actually be interesting to find out. While there are a bunch of traits of those with ASD one that many are high functioning/level 1 are prone to obsessions and repetitive behavior, and routine. If a routine was built around coming to a forum when the person was younger, that could easily continue into adulthood. I won't post it here, but there's a great subreddit for parents/SO's of adults with autism where they talk about what their recent obsession is and give advice on those situations.
To what degree is an autism spectrum condition an illness though
And is spectrum different than autism? (Genuinely dont know, ELI5)