saying gender is not a construct is a strong/radical statement in the context of theory
To be clear, I'm saying gender identity isn't a social construct (gender roles definitely are). And that's hardly a radical statement given that there is a genetic factor to being trans, as evidenced by e.g. twin studies like this one which found a much higher amount of cases where both twins are trans among identical twins (who have the same genetic code) than non-identical twins. Also, like I mentioned before, a lot of trans people feel considerable relief to their own gender dysphoria upon seeking hormone therapy and gender-affirming surgeries, which is quite hard to explain on a social basis.
I don't think there were any bad intentions on OP's end, but the highlighted claim that a person is female and therefore has this or that genitalia is indeed transphobic.
Someone's probably going to show up and say "but it says 'female', not 'woman'!" Well, "female" as an adjective referring to people already means woman. A female doctor is a doctor who is a woman. And "female" as a noun (e.g., "the females") is a terrible way to refer to people, to begin with.