The only connection between this and emacs is that both use a Lisp language (Nyxt is written in Common Lisp)... and that Nyxt is inspired by how emacs works. Anyway, why did you assume it is an emacs plugin? It doesn't say that anywhere.
If you want to wear your underwear as a hat, that's your own business. Don't blame Common Lisp, or the array of editors which have nice support for it.