Are you talking about medically delaying puberty? You're aware that's done with cis kids more often than trans kids, right?
I don't see how it's child abuse when prescribed to a minor with gender dysphoria, but totally fine when it's a minor with precocious puberty.
For many trans people, having the option to postpone irrevocable changes brought on by puberty has massive mental health benefits for the rest of their lives. I feel like you have to be pretty jaded and dismissive to just categorize that as abuse out of hand.