Fedora Flatpak remote: how to add manually?

The Fedora Flatpak remote is likely removed from my system (uBlue Kinoite-main) because in the past it had very few apps.

Now it seems the remote has a ton of apps, even some that are not on Flathub.

Without installing the RPM (which is not possible because of this bug) how do I add the remote with a command?

The command in my repo doesnt work, I get a GPG error.

flatpak remote-add --if-not-exists fedora https://registry.fedoraproject.org
flatpak remote-add --if-not-exists fedora oci+https://registry.fedoraproject.org

I got it from this Fedora Magazine article: