Cannot follow home-manager example

[prescientmoon]

I am trying to follow the HM example. Consider the following HM config:

          nixd = home-manager.lib.homeManagerConfiguration {
            pkgs = nixpkgs.legacyPackages."x86_64-linux";
            modules = [
              ({ lib, config, ... }: {
                home = {
                  username = "adrielus";
                  homeDirectory = "/home/${config.home.username}";
                  stateVersion = "23.05";
                };
              })
            ];
          };

Opening a .nix file shows me completion for nixos (not HM) module options. Trying to evaluate the expression manually with nix eval .#homeConfigurations.nixd.options yields

error:
       … while evaluating the attribute 'meta'

         at «none»:0: (source not available)

       … while evaluating the attribute 'doc'

         at «none»:0: (source not available)

       … while evaluating the attribute 'value'

         at /nix/store/cjvwy2rr87ir1nb6wvs9n6lvbnzlqrdg-source/lib/modules.nix:807:9:

          806|     in warnDeprecation opt //
          807|       { value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          808|         inherit (res.defsFinal') highestPrio;

       … while calling the 'addErrorContext' builtin

         at /nix/store/cjvwy2rr87ir1nb6wvs9n6lvbnzlqrdg-source/lib/modules.nix:807:17:

          806|     in warnDeprecation opt //
          807|       { value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
             |                 ^
          808|         inherit (res.defsFinal') highestPrio;

       … while evaluating the option `meta.doc':

       error: The option `meta.doc' is used but not defined.

[inclyc]

It complains about

error: The option `meta.doc' is used but not defined.

Hmm, how did you setup the environment?

[prescientmoon]

wdym? I have tried with a pinned version of some unstable nixpkgs 23.11. I've also tried with a similar version of 24.05 and got the same error.