I've not read every politicians stance, but I do know several of the objections listed in this article have more to do with limiting what health insurances can coverage, rather than simply outright banning what men and women can do.
You asked a question about something you didn’t think was happening in reality, I was simply providing an answer. I would also claim making laws allowing insurance companies (a group that *loves* not covering anything it doesn’t happen to) not to cover medically-accepted care because of the gender that person was born seems pretty close to telling people what to do. If I passed a law that didn’t make guns illegal, but made each bullet a million dollars, is that not basically telling people they can’t legally shoot them?