Interesting claim – wording presumably taken from the whitehouse website at https://www.whitehouse.gov/about-the-white-house/our-government/the-constitution/ Anything this White House says about anything is suspect, especially since the name of the delegate isn’t mentioned. So, i went to https://www.constitutionfacts.com/us-constitution-amendments/those-who-didnt-sign-the-constitution/ . Several delegates didn’t sign for all sorts of reasons, typically health. Luther Martin didn’t sign “because he felt it violated states’ rights”. George Mason did the same. Elbridge Gerry didn’t sign “because it didn’t include a Bill of Rights.” No mention of anyone not signing because it supposedly codified slavery. So, you’ll have to do better. The fact remains that the provision did not allow slave states to do what they wanted.
Get your facts and historical context right. The 3/5 provision in the constitution was NOT what the slave-owning states wanted. The slave states wanted ALL people counted for purposes of assigning representation in Congress. The non-slave states wanted NONE of the slaves counted so that slave states had fewer representatives in Congress. So, the provision’s inclusion actually means the exact opposite of what you claim it does.
The song in the first panel is all along the watchtower? Significance?