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.
Nope.
C&Ds and legal threats still go to a person who isn’t going to go to jail or have their wages garnished by Mario until the end of their days.
At best you have a single gitlab instance running in a country that is known to not cooperate with those kinds of demands. But… just ask the various torrent sites how well that works after actively pissing off an army of lawyers who don’t mind slipping a hosting company a couple hundred bucks to get the identity and address of the person paying for that.