Death Paradise

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

Generative AI tools were used to assist in creating and enhancing selected promotional artwork and store page images. These materials are based on the game’s characters, environments, weapons, and visual direction, and were reviewed and edited by the development team. The game itself does not generate AI content 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.