I didn't mean installed by default. Rather that it was available along with a few others which appear to have disappeared from the repositories that are default in Kodi/Libreelec,
If the Aeon Nox developer (who is a Team Kodi member) keeps the add-on updated in the Kodi repo it will be available for install. If it's not kept updated then Kodi may not show it as available and compatible. It's nothing to do with LE.