No, that is not correct. A ruling by the Supreme Court has the force of law. It is not just an opinion. The fact that some lower courts choose to interpret the ruling inconsistently does not change that fact. If enough of those lower courts rule inconsistently with the Supreme Court's ruling, eventually the Court will grant cert. in another case and clarify its ruling. We are overdue for such a 2nd Amendment ruling by the Supremes.

Nothing the government gives you is free.