It's difficult tonknow what the original poster meant, but one of the features of gender identity ideology is a post-modern approach to words that means they no longer describe reality but create it. Words, therefore become pretty meaningless without a shared basis in the real world.
Leasbian could mean homosexual women in the sense most people are familiar with, so female people who are attracted to female people.
But it could mean "women" in the gender identity sense of "whoever describes themselves as a woman" being attracted to other such "women". Lesbian therefore being defined by gender identity, not sex.
As for the non-transphobic bit, lesbians were one of the early demographics to speak out against gender identity and trans identifying men, see "the cotton ceiling". However there are lesbian groups who accept men into their dating pool, for whatever reason, if those men describe themselves as "women".
But given the OP was just another plopper I think it was just to he an edgy adolescent.
Hope that's a reasonable starter!