My point in mentioning your link was that it had a link to UNC's team, which showed that Jordan averaged slightly less than 20 ppg. So it wasn't entirely about Dan Dakich, although he did hold Jordan considerably below his scoring average.
As for Dean Smith, I agree that the joke isn't entirely fair to him, although it is what it is. Of course, in the pre-shot clock days, Smith was well known for employing the four corners offense with the lead, in an effort to bleed the game clock and prevent the opponent from mounting a comeback. That held every player's scoring average down.