He is correct.
Sure you have some great black musicians like bb king, jimi Hendrix, Louis Armstrong. But all in all most famous black musicians are just singers or jazz muscians and very very very few are rockers.
For every Living colour you have 100 white rock bands. Nearly all of the best rock, metal, etc are all white. And all of the classic and influential rock bands are all white.
Most blacks don't even play an instrument anymore. Almost all the blacks that are in music today just have generic computer generated music and auto tunes.
He isn't rock, but Louis Armstrong had more musical talent and ability in his finger than modern black musicians poses in their entire bodies.
Even motley Crue has more talent than any black musician since them because at least they wrote their own music, played instruments and so on and had multiple songs people still know and sing even today.