Wanjie: Cycle of Oblivion

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

Generative AI was used to assist in creating some pre-generated art assets, including portions of card artwork, UI decorations, and store marketing imagery. All AI-assisted assets are reviewed, edited, and integrated by the developer before inclusion. The game does not use generative AI to generate content while running.

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.