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

Some of the game's artwork (such as background images) and store/marketing assets were created with the assistance of generative AI tools, and all of them were reviewed and adjusted by the developer. Some in-game descriptive texts were also drafted with AI assistance and manually verified. All AI-assisted content is pre-rendered — the game does not generate any content or code with AI during gameplay. Trailer narration uses VOICEVOX text-to-speech (VOICEVOX: Zundamon).

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.