For what it's worth, Usada Pekora is a vtuber (a streamer who presents themselves as a mocapped anime/cartoon/3D avatar) who is never implied to be underage. Not that I'm defending whatever Automatic1111 does.
https://github.com/AUTOMATIC1111/stable-diffusion-webui/wiki...
Look at some of the embeddings in the mega link, there is unambiguous loli content there.
In general when it comes to porn and porn-adjacent content, "I know it when I see it" remains how the law generally works :(
There are VTubers and video game characters that in their canonical profiles will say things like 'eternally 17' or whatever. How is a regulator supposed to interpret something like that when deciding whether something is meant by the artist to be transgressive or not? We know the actresses involved and the artists are all adults, of course.