Perhaps it is, but medical procedures are not.
The title deliberately avoids explaining what exactly the “sex change” would be, and what exactly would make these rare “female” Moclans different from the “male” ones because it can't. Evidently these “male” Moclans can reproduce with one another and lay eggs, and it's deliberately not ever explained how exactly these “female” Moclans tie into the Moclan reproductive system and if they can at all reproduce with the male ones in some capacity or not, and what the difference in their genitals would be. Evidently male Moclans do not simply have a “scrotum and a penis” because they must have something that deposits eggs and something that forms them.
It thus tries to be deep by suggesting that it there are two perspectives: from the human perspective, they are normal “healthy females”, but from the Moclan perspective they are simply a birth defect that is to be correct just as humans correct various birth defects, but it is never explained how these genitals would look for Finn to decide that Topa was a “healthy female Moclan”. — No matter how I think of it, it does not make sense.