I work in a legal deposit library and you would not believe the amount of AI generated books we've started receiving. Recently this seems to be a new trend, presumably to get the guide to the top of the search when the game does release.
And First Light is far from unique. Search Pragamata game guide, GTA VI game guide etc on Amazon and you'll get similar results.
I know game guides in book-form are probably already a bit of a dead end, but still sad to see.