Gender identity is measurable and identifiable in many situations.
As much as there is a pushback against intersex conditions and trans identities being linked, there are many intersex conditions that give rise to an immutable gender identity opposite to chromosomal and physical identifiers.
Identical twins are more likely to both be trans than non-identical.
None of this is news to the medical establishment, there are policy papers and position statements on the existence of gender identity.
It seems the only people that refuse to accept this are the same people campaigning to limit trans rights.
Which is why fighting natural diversity is doomed to fail.
When I read people and sometimes posts on here that say there is no evidence for gender identity or trans people are the result of disordered behaviours, it sometimes amuses me just how uninformed it requires someone to be to follow this transphobic mindset.
And why more and more people see you.