When I read DL's background, where he came from, who he has become, and then compared it with the comments by his peers and even by Elijah himself, it almost feels like Elijah heard something that wasn't said. It was pretty far out of character for DL based on his life experience.
I am not saying that this happened but... for example. My ears are just fine but sometimes I am a bit DEEF. My wife calls me "NOT THE LYRIC'S KING" because I am convinced that songs say something that they don't. For a decade I sang "Let me go home, like a GLISTER in the Sun". I think I even put Glister in a paper at school when trying to describe a shining object. Later when my wife mocked me for it I decided to show her so I looked it up. When I saw I was dead wrong and that there is no such thing as a GLISTER, I copied and pasted the lyrics to microsoft word, changed the lyrics, printed it out, and showed her. Yeah, I felt dumb but we laugh about it to this day. I think I heard that song hundreds of times and yet I was convinced of what I heard.
Point is, this doesn't match DLs anti-racist history. If it happened, I think he has done more to create a culture of anti-racism around the Jazz and to condemn these things when they happened in the past than most of us have done from our keyboards.