Isn’t she making the opposite of the point she wants to make?
I think she's trying to dispute LGB Alliance's view that they're trying to LGB protect people from "transing the gay away" - thinking in particular of gay children. LGB Alliance asserting that the transition takes them from "gay" to "straight" in gender-terms.
Mermaids are countering that with "well, actually lots of 'trans' people are 'gay' post-transition", pointing at the heterosexual adult male transitioners.
Of course childhood "transitions" are not the same as adult male "transitions". Totally different cohorts with totally different motivations, and LGB Alliance isn't trying to represent the heterosexual adult male population.
Trans "umbrella" being used to obfuscate.
Classic Bailey and Blanchard article, although maybe a bit dated, and most of us know this, I think.
Gender dysphoria is not one thing