Yeah, definitely. Think of it as what the post calls a "system" package manager. The difference between nix and the SPMs mentioned by the post is that in the former case, control over dependencies lies with you, not with the package manager.

In other words, with nix you decide the spec of the software you want installed on your machine, not the maintainer of your chosen package manager. Depending on your use case and knowledge/experience level, either choice may be preferable.

Also, nixpkgs is definitively the widest-spanning "package manager" on the "market"; see link.

https://en.wikipedia.org/wiki/Nix_(package_manager)#Nixpkgs