This is about porting a distribution to hardware. Nixos is really great at bootstrapping/rebuilding a system against your own clone of nixpkgs.
The complaints of the article ends with any Linux distribution and docker. I'm not sure which distributions would use docker in their own porting process. Most distributions have a huge distinction between users and maintainers and probably no one who is a target of that article is aware of the pains of maintaining a Linux distribution when they agree traditional distributions are fun.
Context: https://hands-on.cloud/why-you-should-never-ever-use-nixos/