4am

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

Some of the graphical assets in this game were created using generative AI tools. This includes certain 3D models (characters and props), textures, background illustrations, and UI images; some of the key art on this store page was created the same way. All AI-generated assets were curated, edited, and placed by the developer, and no AI content is generated in real time during gameplay.

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.