Flatpak don't work

[VandaLHJ]

flatpak remote-add --if-not-exists --from jcrenshaw https://pkg.jcrenshaw.dev/flatpak/jcrenshaw.flatpakrepo
error: can't read or something (different language loose translation) URI https://pkg.jcrenshaw.dev/flatpak/jcrenshaw.flatpakrepo: Server returned status 404

Which make the flatpak not usable for end user.

[Dragonsong3k]

Same:

 flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
flatpak remote-add --if-not-exists --from jcrenshaw https://pkg.jcrenshaw.dev/flatpak/jcrenshaw.flatpakrepo
flatpak install jcrenshaw com.vintagetechie.CosmicExtAppletTempest
error: Can't load uri https://pkg.jcrenshaw.dev/flatpak/jcrenshaw.flatpakrepo: Server returned status 404

Looking for matches…
error: Unable to load summary from remote jcrenshaw: While fetching https://dl.jcrenshaw.dev/repo/summary.idx: [60] SSL peer certificate or SSH remote key was not OK