I remember when people claimed to use NixOs in order to have a deterministic, repeatable setup.

AI generated Nix is equally deterministic and repeatable. The deterministic behavior makes Nix well suited for AI yolo code, either it evaluates and builds or it doesn't, and if the result isn't functional you revert back to the previous generation.

That is the use case for NixOS yes, can you clarify how it is no longer deterministic? I have been using it for a few months and was not aware of this change