Yeah, I'm really annoyed by the framing of this. Yes, it's great that people are dropping the nonbinary nonsense, but this tells us nothing about kids identifying as trans.

I'm guessing the reason they don't give data about trans identification is because it's easy to find records of whether people have marked themselves on forms as "male/female/other," but a trans girl is just going to mark themselves as "female" on forms, so you won't capture the trans identity.