Donald Glover stars in Solo: A Star Wars Story, the number one movie in the nation. Childish Gambino's hit track "This Is America" is the most streamed song in the nation.
What makes this extra impressive is Glover and Gambino are the same person. (Although they do have different faces.)
One would assume any rap fan would know this. One pretty prominent rapper may not.
Maybe Cardi B was joking, as she's known to troll around on the Internet. That delete though ...