Nix-ld is only used by unpatched executables that use the link loader at /lib
or /lib64. If you use for example python from nixpkgs than it will not pick
up NIX_LD_LIBRARY_PATH and NIX_LD since these types of binaries are
configured to use a glibc from the nix store.
Ah, I guess that's why I've seen folks recommend just having uv install the python interpreter as well, so everything python uses the same link loder from nix-ld.