Nintendo is taking a new approach to this one, claiming it’s a copyright protection circumvention product. There isn’t any precedent for this yet, and it isn’t protected by the interoperability exception in the DMCA.
This is actually a very scary and very important one to follow, and if Nintendo can successfully convince a judge that the primary purpose of emulators like Yuzu (which decrypt games on the fly) is circumvention, it’s going to open the floodgates against emulators for any systems newer than the PS2.