It is a good read (or view). Oddly, I first heard that more African slaves went to the Muslim world than to the West fifteen or more years ago from Henry Louis Gates when he was still at Duke. There was some PBS special about Africa and slavery, and practically the last words in the last segment were Gates and someone discussing the fact (first mention in that series) that more African slaves went to the Muslim world than to the West.
Gates final words were to the effect: "that needs to be investigated more thoroughly." Haven't heard if any more thorough investigation has taken place, at least with any involvement from Gates. Maybe there will be some more information in this new series...
I watched an episode or two of his tv thing on discovering your roots. What struck me about one episode when he was talking to some AA at a barbershop (i think) and they had done the dna test to see how much African vs how much White they had in them. The guys were celebrating the results with fist pumps when they were told how little “white” they had in them. I found that disturbing.