Harem vs Zombies

The developers describe how their game uses AI generated content like this:

Character designs are created manually by artists and writers, but we use AI to speed up the drawing of details. We also use AI to speed up the drawing of backgrounds and H-scenes. AI is not used to generate content directly during the game.

Required on Steam store pages since 2024. It covers content that ships in the game, on its store page or in its marketing — Valve does not require a disclosure for AI tools used during development, so this says nothing either way about how the game was made. Check it on Steam.