Considering that the term, cisgender is a made up to be inflammatory and demeaning, it throws this whole study into question.
I have been postulating a connection between autism and trans problems ever since the Audrey Hale mass shooting. I mentioned it when I said that it was perhaps not the best thing to release her manifesto. She was autistic and not rational. I don’t know why anyone would want to read about her blaming the counselor at the Christian school for trying to convince her that she was a woman. She agreed to the counseling. She was an adult, no one could have stopped her.
So then your postulation was probably correct.