Amaty has been extremely upfront on other platforms about not liking AI (You can even play the April Fools update IN THIS GAME to see some jabs at it,) and on Patreon often discusses commissions for artists she pays.
And I really feel inclined to remind people that generative AI is trained off real people, you can plug anything into an AI detector and get a relatively worrying percentage, tools like that just don't work these days due to how expansive training centers have gotten.
Source: I work in tech and was fired last to be replaced by gen-AI and the cubicles I worked in got replaced with a server room to run training in.
There's a lot of AI crap on this site, but this game is relatively upfront about not being so and has the evidence to back it up with early sketches and works in progress being shared on other platforms.
Please do research besides "The vibe's off" before accusing an independent creator of using AI.