Boring article. Lots of white music is definitely derived from black music but there's no rule that black people can't keep making it too. I think that some white artists like Elvis Presley are overrated in the context of early rock music but I also don't think that Presley showed anything but reverence toward the black musicians of the era. Other bands, including The Rolling Stones, Led Zeppelin and the like continued to make music heavily inspired by black musicians into the 1970s and beyond but thos article makes it seem like there was some concerted effort by white people to invalidate the origins of rock music as being a creation of black artists.
I do think that it's interesting that many of the musical styles that are distinctly American in origin, such as blues, rock, jazz, country and hip-hop music are all largely the creation of black artists, but this article spends too much time on the conspiracy theory when it could have just been an article praising black musicians and it would have been a much more enjoyable reading experience.