The only problem is that the dysphoria moved to different things
Yes, I've seen this - that they pin everything on surgery curing them, and after the initial euphoria has worn off, they discover they're not cured (because there was nothing wrong with their body in the first place, so why would they be), and feel even worse.
Note that this is for people rushed into it. I'd imagine that if, after a lot of therapy, you find that you can't just get over some body part, and have surgery to change it, then you'd feel better, you'd feel relief - but you have to be really sure that it's the body part that's the problem, not that it's a focus for a different problem entirely.