I understand making a game is hard work. But AI art is still in a super morally grey area, but I won't put that heavy blame on you, I'll direct that towards the people who made the AI art program itself, I honestly think that having just the text description of the tour mode events is good enough and that having no art there is better is using AI art.
I've been following the updates of your game for a while and I'm saying this because I genuinely like the game and was looking forward for each new update. If your game gets more traction I think there will be a lot of people who would see the AI art, quickly uninstall the game, then immediately assume that you're a distrustful person and I don't want that to happen to you.