I don’t think they are. I never read or hear anything about gender affirming care being limited to things that are reversible. It’s a deliberate euphemism that can be used for anything. If the fight isn’t about irreversible changes, why not separate the two so at least one can get accepted?

I’m personally against the breast enhancements for children that you mention as well, but in that case I think it’s generally accepted as tattoo’s are: with permission from the parents and not paid by the public.