He's an idiot.

I spent three years researching Jamestown and wrote a novel based on the research. It is excellent by the way.....The River of Pearl and Gold: A Story of Jamestown. It is available at Amazon, Barnes & Noble and fine booksellers everywhere.
Chattel slavery did not come into legal existence in America until the mid 1650's. Virtually all the legal documents still exist, including the black man who was one of the first true slave owners.
Blacks owned slaves up through the Civil War. Call it an inconvenient truth. Dims would like to white wash history. Too bad, the documents and facts are there.