“At age 15, 16-ish, then you can start cross hormone treatment if the kid wants. And if for whatever reason the kid changes their mind or things change, you can just stop taking the puberty blockers and the kid goes through puberty normally and grows normally and no harm done.”
Lies, beginning to end. Hormones are powerful chemicals and can not be taken lightly in their effect on a growing human body.
It’s not simply a matter of stopping them and your body continues growing where it left off. Permanent changes have already been made and cannot be undone. They are NOT safe and their effects are completely reversible. There is harm done.
This is beyond something superficial like coloring your hair.
Puberty blockers are used for children with NCCAH to prevent the damage that can occur due to rapid and premature onset of puberty.
Anything else is quackery.