“Remember, the Supreme Ct of California overwhelmingly found that Prop 8 is valid. “
The California SC ruled that Prop 8 was indeed an amendment, not a revision, and that the ballot initiative was proper. They made no ruling on whether it was constitutional. That’s what the current case is about.
No, the issue of a properly enacted amendment was addressed before the election. The California Supreme Court did address it’s constitutionality (with respect to California’s Constitution) after it became part of the Constitution, and it passed muster with them. This case is outside of California altogether.