I think I have it right.
This would mean nothing in the face of federal law upheld by a federal court.
The Dems in state legislatures nullified integration down South back around 1960 and we all know how that ended. It was a trick by politicians to get segregationist votes.
They enumerated the specific things that the federal government could do, and then buttoned it all up with the Tenth Amendment.
The powers not delegated to the United States by the Constitution, nor prohibited by it to the states, are reserved to the states respectively, or to the people.
Of course, both in 1960 as well as 1860, the federal government prevailed due to superior force. Will third time be a "charm" and states be able to assert their sovereignty? We shall see. I like it that Alabama is at least moving in that direction.