You're right, this is CAFC, where all patent matters end up (the case originally involved a patent dispute, but that was dropped very early).
SCOTUS has not looked kindly on CAFC when it comes to patents, almost always overturning CAFC's decisions as being utter lunacy. I hope that same skepticism will transfer to copyright.
The 9th is involved in spirit because the Federal Circuit was in principle bound to apply 9th Circuit law on the copyright claims (which, arguably, they did not do.)
But that's mostly immaterial at the Supreme Court, as the Supreme Court isn't deciding based on whether the CAFC correctly applied 9th Circuit precedent.
The appellate ruling originated from the Federal Circuit, but only because Oracle's suit included a patent claim that didn't last long—the Federal Circuit is the appellate court for all patent-related stuff. For the non-patent stuff (ie. the copyright stuff), the Federal Circuit was supposed to follow precedent from the local circuit: the 9th. They didn't.
SCOTUS has not looked kindly on CAFC when it comes to patents, almost always overturning CAFC's decisions as being utter lunacy. I hope that same skepticism will transfer to copyright.