I don't see the Federal Supreme Court weigh in on this, and without that I don't see how California can impose it's laws on people out of state. It's no different from any other law-- take open carry gun laws as an example. A state that prohibited open carry would not be able to assign liability to someone that open carried in a state where it was legal. It really doesn't matter what the California Supreme court says, they don't have authority outside of California. I suppose they could make laws about how such recording could be used if they entered in California, but not much else.