With that said where the fuck did this model get its training data for 14 year olds.

Nowhere, at least for any model you could get your hands at in public places like civitai. Or, well, it's not like they can tell whether someone trained on those kinds of pictures but they're rightly nuking any underage/loli example images, as well as anyone who posts them, from orbit.

Generally speaking models can be very good at mixing concepts they have an understanding of, say a giraffe with zebra stripes, but that doesn't mean that you can just combine anything -- if you try to generate a nude human with zebra fur you're bound to get body paint, random skimpy zebra-striped clothing, or at most a fursuit, not convincing fur, unless you use a model trained by furries but at that point you'll have trouble generating faces without muzzles: The AI just doesn't know how actual zebrakin look like so it's either copping out or making stuff up.

I've never tried nor am I remotely attracted to that age range but I wouldn't be surprised if a paedophile would complain "these aren't kids they're scaled-down adults". Things like the difference between budding and small breasts, ask a biologist I haven't seen 14yold breasts in over two decades.

On another note though I'd much rather have paedophiles jack off to generated images than doing anything involving actual children, including creeping around. Lesser of two evils and all that. Therapy, of course, is preferable to both.