According to an official statement on Ryujinx’s Discord server, developer gdkchan was contacted by Nintendo and they were offered an agreement to stop working on the emulator project, and while the agreement wasn’t confirmed yet, the organization has been entirely removed.
I think you might have the latest. The flatpak version that is currently on my machine is 1.1.1397 – But the source I just grabbed and didn’t build is more recent.
EDIT: The flathub build is still up – For now. I pulled the latest update from there. It was 1.1.1403