From the link:
I am a member of the LGBTQ community. My gender identity is male and my gender expression is female.
No. There is nothing inherently 'female' about having long hair and liking makeup and dresses. Those things are feminine-coded, which CJ acknowledges later in the paragraph, but conflating 'feminine' with 'female' is reifying gender stereotypes, which is harmful.
Also, being a feminine boy doesn't make you part of the LGBT community. Of course it's possible that CJ is gay or bisexual, but that isn't what's being implied here.
I think that perhaps because CJ rejects masculine stereotypes so strongly, he doesn't realise that almost everyone has a combination of masculine- and feminine-coded traits and interests. For gender to really be over, a label like 'gender creative' wouldn't be needed, because everyone could dress however they liked without any reference to or thought of gender.
Of course, in that utopia, things like school sports would, logically, be divided by biological sex. Nobody would care if some of the boys on the boys' team liked wearing skirts.