Maybe I got it the other way and Yuzu did not require. Did a quick research and seems like the opposite, maybe the person I was listening to (or read, honestly don't remember the source) got it twisted?? I'm sorry for my misinformation and will edit my above reply. I did not know this and always installed firmware, title.keys and prod.keys.

The suyu devs themselves said that the DMCA request didn’t even come from Nintendo, it came from gitlab automatically because they forked a repo that was taken down.

That would sound plausible, if it wasn't that much delayed from the actual takedown of original Yuzu. If this is true, then they will probably work on Suyu elsewhere.