It’s not one unpublished study. Its dozens.
Did you even read this article? The doctor in question is saying this study, that hasn't been published or peer-reviewed by the way, might be politicized by cretins like you to deny children the affirming care they need. Again, an expert seems to think it's the right method, but because of the fewer than 100 persons involved in this study weren't depressed prior to the treatment, then morons might you might say "it makes no difference to people's mental health either way". The article also cites an older study which proved gender affirming care DOES help young people, but here you are lying about that.
I'll ask once more, why do you believe gender affirming care is bad for these individuals despite what medical experts say? Why would you seek to ban such care despite parents and their children agreeing to have it?