This is a bit of a bold statement, but I think Kamiya Yuu, the creator of NGNL, has used AI in a few of their latest works. These ones to be specific:
post #7605100
post #8615106
post #8537494
post #7547027
Here I circled some signs of AI on them:
https://files.catbox.moe/izs9ow.png
https://files.catbox.moe/2sp54z.png
https://files.catbox.moe/rzol2r.png
https://files.catbox.moe/iaulip.png
I assume he's doing the sketches on his own, then using AI with controlnet for painting and details, and then maybe editing some things manually on his own - but that would still warrant an ai-assisted...
Please take a look and see what you think