I am not interpreting it that way. I'm interpreting it to prohibit the undermining of the laws of other states regarding slavery as applied to citizens of those other states.
As states ban slavery to those born inside their borders, slavery would eventually atrit to nonexistent, but unfortunately, the laws of other states regarding slavery cannot be ignored just because they are unpopular in the states where it is no longer practiced.
This whole thing reminds me of the same sort of social dynamics involving "gay marriage" and other liberal causes du jour. Liberals get social "enlightened" and then can't leave everyone else well enough alone.
For some reason they feel the need to spread their moral enlightenment to other people who aren't interest in their latest greatest moral epiphany.
Now we have transgenders beating down the door of our Military, and the latest Liberal Morality is that they deserve to serve in our Military.