Those findings are not irrefutable
You trust Reuters, right?
https://www.reuters.com/article/us-usa-lgbt-biology-idUSKBN1AJ0F0
There is a certain reality that taking hormones to change the hormone production of your body will have a measurable change on your brain.
Secondly, Reuters mentions the study you linked was refuted by over 600 academic scientists, so clearly even in the field of science this is still a subject of fierce debate, and doesn't have a definitive answer.
It's possible it ends up being something biological, but we're not there yet. Personally, I don't really think social identity is a biological thing, but maybe I end up being wrong. I'm a free thinker, so i don't like the concept of social identity and gender being tied to biogenetics.
What study did I link? Because I gave you the collection of all the studies put together that show a link between biological basis and being trans. I don't know how you can discount all of that to just spread your own bullshit about what you want about our identies