Gods but I feel such an idiot for not having thought of it earlier, but a GC tweep shared a link to an FTM sex worker page here and now it is obvious.

Do you know what a female 'trans man' looks like after puberty blockers and mastectomy, but without a lot of T?

A little girl.

Rory @ForsbergPam 🎯 🎯🎯
Allowing children to undergo medical transition (drugs and surgery) that will permanently alter their body and their mind before the legal age of consent because they are supposedly mature enough completely undermines the bedrock principle of age of consent. Pedos dream.