If Kid Rocks publicist had planted the story just to get his name out there then I think we would have heard from them at some point. Neither of them have said anything.
Did they deny it? Hello!!
It wasn't til after it was established clearly that he would not be "performing" that they publicist said anyting, and it was the face saving "it was never planned".
Now, retro, don't try using "clear" thinking in these discussions..........LOL.