it's specifically "Bad" that he identifies as the start of the decline.
you might be better watching the video, and the next one about self-loathing, it's hard for me to explain it. jafa's position seems to be very critical and basically seems to amount to "sell out" but as always with jafa, there's more nuance than that. like in the other video, he talks about mj as a shape-shifter and how this is a recurring black motif.
but worth noting that the videos are from 12 years ago and well before he (jafa) became famous. so he's a bit rawer i suppose is what i'm saying.
check the thread i did on arthur jafa
https://www.dissensus.com/index.php?threads/15585/ he's worth looking into. sort of like kodwo but american and more personal storyteller.