Conversely, Frederick Douglass believed that the Constitution is anti-slavery, because of the details of its formation. Here's an idea of what he thinks:
The American Constitution and the Slave - Is the Constitution pro-slavery or anti-slavery? - By Frederick Douglass
I know who I agree with. Interestingly, Douglass is super detailed as to why the Constitution is anti-slavery, wheras Mystal just spouts some talking points that only sound cute to a sympathetic crowd. I'm sure, to be fair, that Mystal gets detailed in his book "Allow Me to Retort: A Black Guy's Guide to the Constitution." I know I would not purchase that, but you can do what you want.
It seems to me that these people really want to keep themselves in the dark and just keep saying the same tired old things over and over again.