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NixOS is still a Linux system, and the configuration still translates to stuff you have in a very similar way on every other Linux system too (with the exception of what’s needed for the file system layout to work). It’s not some kind of magic. I’ve probably learned as much stuff applicable to general Linux distributions as while using Arch and Gentoo.
Of course, if you only use the high-level options and the graphical installer that may be different, but then comparing it to those distros is very disingenuous.
How many jobs opportunities ask for experience with nixos?
I know of companies like Serokell that specialize in it, and I know that some others use it internally for CI. Generally if you want a Nix job you’ll have to specifically look for that I think