GP is describing a well-known phenomenon that spans countries, cultures and history: majority culture having a love/hate relationship with minorities, with extraordinary individuals on one side and diffuse fear and hatred on the other. Go read Othello's speeches.
Not every instance of white people liking or consuming black culture is that of a racist parasite trying to bleed the culture dry though. Sometimes white people just like stuff, and their interests overlap (as in this case with esotericism and music.) Culture works that way for everyone. The author doesn't seem to be trying to redefine anything or whitewash John Coltrane or what have you.
So I know what they're saying. Do you not?