Hi Neil,
Good to hear that you did take a look at the readme š.
You can think of the LSP as a specification for cross-editor/IDE extensions. The intent of this is to make some of Orgās functionality accessible to the ~95% of people who donāt use Emacs, by hooking into Emacs itself.
Does that clear things up for you? You can also see https://langserver.org/.
All the best,
Timothy