To Sophie, sex change = haircut.
I gotta sperg on the protogay children article a bit but assuming she still holds the same or similar views, she believes sex is irrelevant, because all homophobia (context is in primary school) is generated by kids reacting to other kids behaviours (like mannerisms) and not actual sexual behaviour (actually being male and willingly taking up a dick up your butt)
She concludes that anti homophobia measures should be tailored to gender expression, and there was also a lot of talk about children genitals, but like, a lot lot. Very graphic (penis vulva clitoris etc).
But im reality there seems to be a correlation between those mannerism and homosexuality, though it's not all the time, so...
Anyways, this is probably why she dismisses sex, actually not only for validation but part of her reasoning, that hate/homophobia/nazis/ is caused by the reaction to mannerisms and outward appearance, not actual proven sexual behaviours.
This is somewhat true to some extent (mostly in the first world and mostly among children) but then her conclusions based on this idea/argument goes into crazy territory, she drew some terrible inferences, solutions and conclusions, but I have to reread the article and cover these at a later point.