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

Some visual assets and music in the game were created with the assistance of generative AI tools. All AI-generated elements were manually reviewed, edited, and integrated into the game by the developer. AI was used only as a creative tool during development, while the final design, gameplay systems, and overall game content were created and implemented by the developer. No generative AI is used during gameplay or in real-time by players.

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.