Earlier quoted context omitted.
I'm sure the answer to this question is "He looks more articulate than the average rapper."
Gibes regarding racism aside, some people seem more articulate due to the fact that they carry themselves differently during interviews. Of course, many musicians will keep a persona going during interviews as well, so it's still not a very reliable metric. The most extreme example I've seen was Marilyn Manson, but there are plenty of musicians who rap / sing about really inane stuff and then show that they're way sm…
As mentioned in the article, Jay-Z even raps about doing just that.