I think it might also be the prevalence of co-mordbidities in autistic people. Most have some kind of mental depression or anxiety (I certainly do), not to mention social isolation that may be as a result of the co-morbidities or because of our difference in behaviour.

As a result, when they see how accepted and championed trans people are, and add in a dash of autistic gender-nonconformism due to not having an inherent feeling of what is expected of X or Y gender, they're easily sucked into the ideology since they think they'll finally belong somewhere and understand themselves better.

I personally thought I was genderfluid and demisexual for a hot minute in high school, and even thought at one point that I was a trans man because I preferred to wear men's clothing, which is generally more comfortable than womenswear. I fear for the me who might've been born ten years later, where I would've told that yes indeed I was a transman and I would've damaged myself beyond repair.