UNHUMAN

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

This game uses generative AI tools during development: as a coding assistant to optimize workflow, for some visual assets, for writing and editing in-game text, and for localization. I know AI-assisted development isn't for everyone, and that's fair.

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.