I think Snowflake OS is dead. The NixOS community didn't really get behind it for whatever reason. My guess is that many people don't understand enough about NixOS to contribute, but those that do are too proud of their ability to understand it that making it easier for others would seemingly devalue it. I have noticed that many nerds attach a sense of self-worth to understanding difficult things and will fight tooth and nail when those things are made more simple as it will diminish their self-worth.
Given all options and packages in nixpkgs are already machine readable and indexed, supplying a GUI based tool to procedurally generate nix codes
Nix can create attribute sets from JSON, so there isn't a need to generate nix code. Projects like npins do this albeit for another purpose (locking dependencies without flakes).
Anyway, NixOS is lightyears away from a noon friendly OS because it's also terribly far away from a dev friendly OS.