I imagine by “AI” they mean strictly LLMs from OpenAI and other related sources. It’s more or less a consequence of the term being used as a catch-all by marketing teams even if it’s misleading.
They’ve for sure used machine learning tools in their development process, I have no doubt about that. I mean, that’s literally what code completion is. That’s been a thing for much longer than LLMs though, and it’s really only a supplement to the actual intentions & efforts of the devs using it. Stuff like that is useless if you don’t have any game development expertise.