While this is true, some individuals prefer to continue to call themselves transgender, as they feel it is a strong part of their identity, even if they are passing 100%. I think a lot of the time with LGBTQ individuals, the labels become so deeply ingrained into the self-defined identity that it's challenging to drop them even if they aren't as relevant anymore.

For example, I am a monogamous, married bisexual person. My bisexuality isn't really relevant anymore since I am monogamous with my spouse. I have no other sexual partners, so talking/thinking about my bisexuality isn't as relevant as it was when I was dating/single; however, it is still something that I consider as a static part of my identity despite this, and I am very connected to that sense of identity.

I am also gender variant, and the majority of the time I present and feel as a female, but I still consider my identity as genderfluid (for lack of a better term, I have yet to find one that I feel 100% connected to) despite the fact that I haven't presented or felt as a male in over a decade.