Bud, blockers pause puberty. That Mayo article I linked literally says this and points out its reversible.
If that 10 year old takes blockers because they think they're a woman and they change their mind at 18 then quitting blockers will have them go through puberty in their born sex.
You say mutilation but like I said earlier surgery should not occur until one is an adult.
You need to read this and stop believing the crap you see in this bubble.
Understand how puberty blockers work to suppress puberty. Learn about their benefits, side effects and long-term effects.
www.mayoclinic.org