Rion's Taskbar Mine

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

We use generative AI for some of the following elements. ・Some of the in-game art ・Some of the code ・Some of the banners and trailers on the store page

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.