The Corrupted

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

Some promotional images and in-game 2D visual assets were created or edited with the assistance of generative AI tools. All final assets were reviewed and edited by our art team before inclusion in the game/store page. We have checked the content to ensure it does not include illegal or infringing material.

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.