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.
At least with radicle all the forks will still exist even if the authoritative copy is taken down. And even then I think because radicle is like BitTorrent, anybody who pinned the main repo would still be seeding it so it would be very hard to scrub it completely. The main challenge in using radicle is getting an active contributor with some reputation to maintain their copy on there. Otherwise there’s no momentum and nobody will pin the countless mirrors published by randos.