While your link discusses slavery, it also makes clear the Constitution's language refers to indentured servants or slaves, or potentially even convicts & draft dodgers.
So the Constitution does not "enshrine" slavery specifically, but any state law which might hold a person to service, that law must be honored in the other states.
Nothing says states cannot abolish slavery, enfranchise former slaves, or that states must allow slaves to be kept by owners from other states, as alleged by the Supreme Court's Dred-Scott decision.
Our pro-Confederate propagandists wish us to believe that slavery was immutably "enshrined" in the 1787 Constitution when that is totally false.
Dred Scott goes too far in it's claim that former slaves could not be enfranchised. That matter would be entirely up to the states to decide. The Decision is correct that states cannot completely abolish slavery so long as the constitution protects slavery by the laws of other states.
The Constitution does not mince words. An escaped slave must be given up to the party to whom his labor is due. It doesn't say anything about where any of the parties can be, or must be, or can't be. It makes no claims regarding any specificity of location, therefore it must apply everywhere the constitution itself applies.