His conclusion is "no one should transition," though. That's clearly irresponsible.if there's any truth to this, someone who's not as overreaching as Heyer is going to have to make the case.
Plus, frankly, I don't think that there's much that adults should be restricted from doing to there own bodies. If they regret it later, oh well. Transition-related care is the only thing that is commonly denied on the argument that "they might actually have DID," too. Not non-gender related body modification, vasectomies/hysterectomies, purchasing alcohol, getting married, or any number of other life-altering decisions someone could make.
If I want to get a full-faced tattoo, all I need to do is go to a tattoo parlor and prove I'm 18 or older. Don't see why that isn't being gatekept in the name of protecting people with DID, either.