This basic idea, I first came across in a Sci-Fi novel by Larry Niven, where intervention early enough would mean lack of sexual desire and adult development, but increased intelligence and immortality.
Other sci-fi says, what if you freeze their development at 5, at 10? Forever sweet little kids.................(or in the case of the story I read, a permanent kitten rather than an adult cat).
A bit different to what is being offered here, where normal mental and physical and sexual development being stymied for the sake of.....looking non-binary forever.
My take would be, do we have the right to take away normal adult development away from someone, just because they are in that gap where they are old enough to consent to some things, yet not old enough to fully understand what they are loosing.
Puberty is an important part of natural human growth, mentally and physically. This lie about pausing it, now becomes, why not just stop it happening altogether..........
This is at least the logical endpoint of the use of these drugs in childhood, that you never come off them, and what then? We have seen what happened to Jazz Jennings in terms of surgery and physical and mental development. Do we have a right to deprive anyone of their full mental and sexual development, even if they ask for it? No, because they don't yet have the full development to know what they are sacrificing. We don't have the right to deprive someone of full adulthood.