Surface-level article, Nintendo's main angle of attack here is financial, they're pointing to a lot of evidence on Yuzu's Patreon, such as posting Xenoblade DC running well a day before official release, and subscriber money doubling around TOTK launch. This approach to emulator lawsuits is new territory apparently.
It was fairly quickly demonstrated IIRC that Yuzu could emulate TOTK at higher res and 60fps. So it’s entirely possible to me that Yuzu’s Patreon sub soared because users wanted to play their purchased game on better hardware.
I hope the courts find in favor of Yuzu and set the legal precedent that it’s legal to dump secret numbers and purchased software from a device you own.