Doesn't this require a nightly neovim?

yes it does; completely forgot about that: ther is some standard lua batteries included in nighlty neovim such as lsp/util.lua that are used in this plugin.

In that case I think we should have waited for the neovim release before adding this plugin.

This plugin will trigger a failure when used since its vimscript plugin will try to become a build system of its own, and 'install' things.

Error detected while processing /nix/store/v587bnyaydim9fal8l4p7s2v276lxbxn-vimplugin-nvim-lsp-3bcc387/share/vim-plugins/nvim-lsp/plugin/nvim_lsp.vim:
  line    9:
  E5108: Error executing lua Vim:E739: Cannot create directory /homeless-shelter: permission denied

Hi,
I am not using nix. I simply installed neovim using apt.
I should also mention that I am on WSL2.
The offending line for me is precisely line 34 in log.lua (mkdir -p command).
It is not clear to what the work around is.

I could remove neovim and clone neovim in a non readonly directory, but I am lazy and don't want to have to worry about making sure every future dev environment needs to have the path automatically set. So besides this suggestion, is there a solution?