CHADtree unable to install

[Mach1212]

Repr:

1. mkdir nixvim_minimal && cd nixvim_minimal
2. nix flake init --template github:nix-community/nixvim
3. virtualenv .venv && source .venv/bin/activate
4. Add the following lines to config/default.nix

  extraPython3Packages = ps: with ps; [pynvim-pp];
  plugins.chadtree.enable = true;

4. git add . && nix build && ./result/bin/nvim
5. :CHADdeps

I can't tell if its an issue with my nix python setup or chadtree.
I have searched github for "nixvim chadtree" and NO repos match :(
I think its just broken

In my main config it keeps saying the following no matter how I install it or which python I point it to.