I already know what you're getting at but arguments in favor of breaking gender stereotypes aren't made invalid if the person who originally made them ends up identifying as trans. I know that lots of people like to use situations like that as "evidence that people who break gender stereotypes are just trans-in-denial" and/or a justification for harassing GNC folks (r/egg_irl and r/traaaaaaannnnnnnnnns were especially awful about that back in their heyday) but it's very important to recognize that GNC people are valid in their own right, and trying to generalize them as transgender is hurtful and enforces the toxic gender stereotypes that hurt people.

Oh and before someone tries to twist my words around. No a trans woman wearing a dress doesn't enforce gender stereotypes, what enforces gender stereotypes is to say a person (i.e. a femboy) is trans because they wear a dress without their input on the matter.