Expanding on this, actually our bodies have a sex, not a gender.
You seem to misconstrue the relatively clear meaning of the OP re “gender is a physical thing”.
While many legitimately argue that gender identification and role is a social construct learnt early on in childhood … there is also no good reason to rule out the causative mechanism of hormones and brain structure. These are “physical things:”
When I was 10 I hated girls. Suddenly 2 or 3 years later I was fantasising about them for no reason I was aware of. I wasn’t fantasising about leggy sheep or the young fathers of my school friends.
I have always liked cars, things mechanical and taking them apart and rough games of strength and prowess. I never noticed fashion, liked to discuss hair, what colors/clothes/shoes go with this body type etc etc. Not have I ever cared much about my appearance or how beautiful I seem to others, nor to be noticed in that way. But I know many girls do almost from the time they can see.
They do not tend to rave on about how powerful a car is or how fast it can go.
In short, the roles and characteristics we expect of sexed girls or sexed boys is not wholly socially learnt. There seems to be a “physical” component as well.
I personally recognise that the two can get out of whack and possibly for “physical” reasons even when one’s morphological sexual identity is clear. I don’t know why. A similar dissonance happens with sexual orientation as SSA demonstrates. Even the Church does not rule out a “physical” cause for SSA. So I do not know why anyone would rule out a “physical” cause for Gender Dysphoria as well.
So 1ke I observe you really have no basis for your view “The idea that there is something called “gender” apart from our biological sex [is] a social construct…” if you are postulating it cannot be anything else than a false ideology.
There are still people who believe the same about SSA - that it cannot possibly have a physical causation and that it is all psychological and due to poor upbringing or role models. The Church denies such a tidy universal …and I have little doubt it will eventually say the same about Gender Dysphoria when it one day has something solid to say on the matter.
CONTINUED…