I kind of doubt this because Yuzu doesn’t actually have any of the cryptographic key material that Nintendo could have a valid reason to sue over. They only offer instructions to dump keys, which has to be argued is causing harm because its completely legal to do on consoles and games that you own.
Dolphin ships with the Wii’s AES key but Nintendo never pursued them in court.
Most likely Nintendo won’t get anywhere and only get Yuzu to remove some wiki pages and stuff which will make it slightly harder to use or slow down development by threatening more lawsuits.