Have you noticed it's really hard to get concrete numbers on any trans demographics?
Ever-changing and variable definitions, self-identification, patients "lost to follow-up," no coding/option at all for detransitioners.
That's how unscientific "facts" like the meme 41% become universally accepted. There's no real data.
If you asked people "born <male/female> and not cis," versus "have you taken legal, medical or social steps to be recognized as the opposite sex," the answers would be different, but you would still face difficulties getting people to answer honestly.
I think one way to get an estimate in the real world, without being defunded and preventing further research, would be if you polled every clinic in a city or region that offered HRT, and asked for numbers of estrogen scripts and numbers of testosterone scripts.
This leaves out the question of nonbinary entirely, and doesn't account for people who just change their screen name and start complaining, but there's no way to study the Enlightened Ones without being a bit of a shitlord.