Regarding the articles complaint about not being able to use Flatpak on Manjaro Plasma Mobile: You totally can, it works with Discover, it's just not enabled by default.
I figured it was something like this, but it was far less obvious than the `gnome-software-plugin-flatpak` package that kind of set everything up for me.
Aside from the generic documentation on Flathub I am not aware of any. That said, on recent Manjaro Plasma Mobile Betas it was simply enabled by default.
