probably not, as they are not selling the emulator for profit.
If Nintendo were against ALL types of emulation they could (and would) have gone against all the other emulators that still exist. But they're mostly focused on shutting down for-profit emulators, so that's why they targeted yuzu.
Nintendo Defends Legal Action Against Dolphin, Says Emulators "Stifle Innovation"
and my favorite: "While we recognize the passion that players have for classic games, supporting emulation also supports the illegal piracy of our products. Wherever possible, Nintendo and its licensees attempt to find ways to bring legitimate classics to current systems (via Virtual Console titles, for example)."
If Nintendo were against ALL types of emulation they could (and would) have gone against all the other emulators that still exist. But they're mostly focused on shutting down for-profit emulators, so that's why they targeted yuzu.