Here we can rely on the clear meaning of the text.
Beyond that, the purpose of the paragraph was to give the slave states - all 13 of them - the opportunity to include in the DOI a charge that slavery, and the slave trade, was the fault of the British. And to incentivize citizen support for the revolution by referencing the King's involvement in “exciting those very people to rise in arms among us” - in other words, slave rebellions.
The question you and I have to ask is why did the slave states want to wreck this paragraph?
According to Jefferson's autobiography, Congress struck the passage from the final version of the Declaration in deference to South Carolina and Georgia, who wanted to continue the slave trade with Africa. But that is the easy part to understand. What you keep avoiding is this part, ".....every legislative attempt to prohibit or restrain this execrable commerce." This statement is contrary to your myth that the 13 original colonies were pro-slavery. Who made these legislative attempts that Jefferson speaks of? Perhaps there was an active abolitionist faction alive and well in your mythological pro-slavery North? Perhaps Jefferson is correct that the North voted, not for slavery, but in deference to South Carolina and Georgia?