Yes it was, but in some ways Nintendo still succeeded In what I believe is their goal - to scatter the developers.
By shutting down Yuzu, they fragmented everyone into forking their own copies and competing to become the next Yuzu.
What’s more of a threat to them? One emulator with thousands of contributors, or 1000 emulators with 2-5 contributors each?
The best thing about open source is the pooling of developers and resources. While forking is neither a good nor a bad thing, it does tend to break up the developer pool.
It could take anywhere from months to years if at all for everyone to finally settle on a single fork and get back to the level of developer pool that originally existed - then if that happens, Nintendo can come along and do it all over again, at least untill they don’t see the value in continuing.