OK, now I know for sure it's bullshit.
"getting his body fixed up so he doesn't have to take the hormones anymore his body will just make them for him from now on."
Sorry, but I know for a fact that this doesn't work. Nothing current modern medicine can do will make your body produce hormones of the opposite gender.
Aside from which, it's overkill. If it was really about his voice, all he'd need to do is get castrated.
And actual full sex change is completely redundant.