Which is why after many decades of research the only treatment that’s been found to work is aligning the body with the mind - as at that point the mind continues perceiving the body correctly but this time it’s congruent with it’s mental model which alleviates the distress.
Just because the best treatment involves physical alteration doesn't change whether it's a mental disorder. You don't classify disorders by how they're addressed, you classify them as where they occur. Whether we term it a disorder, incongruence, etc, the fact remains that the distress happens in the mind.
That said, not all disorders (or whatever you want to call them) need to be "fixed" (i.e. made to be in line w/ the majority), they're merely a way to distinguish one group of the population from another. Sometimes the best treatment is no treatment, sometimes is physical alteration, sometimes it's medication, and sometimes it's psychotherapy.
The average person shouldn't really care what treatment option an individual chooses to alleviate their symptoms, and the "best" option can very well vary by person. Whether we call it a "disorder" isn't the issue, the issue is the social impact of assigning a label (i.e. how others react to it). So to me, calling it a disorder should never be against any forum rules, the rules should instead focus on banning harassment, and calling it a disorder could constitute harassment given context.