Shao Song I

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

游戏中的部分动画与部分图片素材使用了AI进行生成

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.