That's a distinction only relevant for research, not an actual product.
People can and do use AI detectors on any art style, often to justify harrassment of suspected AI use. In the anime community, it's especially very common to do so.
A bad AI detector is worse than no AI detection at all, so extra scrutiny is justified.
Wasn't aware of that context in the anime art community, that's good to know about, so thanks. Currently, artist drawn anime images weren't a primary stylistic focus, so the gap makes sense.
"I tried it on anime images and it didn't work well on that class" would have been sufficient.