I guess he has a Proven track record...
*pauses for laughter*...
Laugh, you bastards!
In any case, I think this guy misses the point regarding /nix/store naming conventions, particularly the dependency graph hash after every package name. This little brilliant thing basically tells you all you need to know about it's association. It's also part of why you can have several packages from several different closures without resorting to adding -1, -2, etc.
That being said, I have been eyeing Guix because of how the nix community was run... but let's see how things go.