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Arch celebrating plasma 6 dropping a week after NixOS
(i.imgflip.com)
Picture of Skinner from "The Simpsons" with the linux logo on his face and the word "Pathetic" in the bottom center of the picture.
The similarities are superficial at best. The only thing similar is that it uses braces for attribute sets (objects) and square brackets for lists. And I guess quotes for strings.
But otherwise it's a full (functional) programming language, with functions, variable bindings, etc.
Flakes aren't perfect, but they are really good for ensuring that you have completely reproducible builds since the version used for every dependency is pinned.