Request #43267 has been Rejected by MarsSeed [1]: Revoking, based on feedback by owner @macdems. It seems this package is functional on its own, without sphinx, and it makes sense to keep it for some consumers that don't need the whole mega-suite of sphinx.
ReadTheDocs also says about napoleon that it is still workable individually. [1] https://aur.archlinux.org/account/MarsSeed/
