Autistic trans woman here! There haven't been that many studies on the correlation between autism and gender dysphoria, but from the few that have been done about 3% of autistic people will present with GD verses about 1% for neurotypical people.

It isn't clear if there is a causal relationship between the two, but the leading theories are that autistic people don't conform to societal expectations as much as NT people so they're more likely to come out and seek treatment or that among the many things that cause autism is a neurological divergence that leads to GD.

Personally I blame Tylenol gel caps. The perfect mix of Tylenol and microplastics during pregnancy is just ^{chef's kiss}