for future reference you should really consider installing it with the determinate nix installer [0] instead. it's multi-platform and among other things creates an install receipt so that changes can be painlessly reverted.
Fairly sure that is what I used, though I remember being confused about whether Determinate Systems was the legit way, or super opinionated not necessarily most supported way, which was going to be least friction/widest adoption, etc.
[0] https://determinate.systems/nix-installer/