You are clearly not concerned for your son OP.
I think what has been done to him is awful. He is an autistic YP who has been encouraged to believe a lie. A lie that will likely harm him, he has already says he can't engage in sexual activity and he may go on to harm himself further with radical elective surgeries. Despite all of this he is not and never will be a woman.
He is harming others too, because any time he uses a woman's single sex space he is saying he doesn't care about the impact of him being there on women.
He is part of an ideology that is puts rapists in women's prisons and in women's single sex NHS wards. He is part of an ideology that harms women and girls sporting opportunities.
I would have parented VERY differently and I wouldn't come out with claims that he is highly intelligent and has not been brainwashed. He believes a lie because he has been enabled by you and others around him. He has been brainwashed. It's terribly sad.