Doesn't matter.
The question isn't slavery, the question is the right to secede. Most states adopted the Constitution but specifically reserved the right to secede later.
I don't suppose you have anything to support this claim, do you? It's true that a couple of states did attempt to ratify with their fingers crossed behind their backs, but, apart from the issue of whether such a thing is legal, it was hardly "most."
Total Neo-confederate myth. Three states ratified with a request (not a demand) that a Bill of Rights be amended to the Constitution -- New York, Virginia and North Carolina.
No one at the time of adoption considered these ratification resolutions to be either conditional or in any way allowing unilateral secession.