The advertisement is a follow-up to what was apparently a successful Papa John's bit featuring Jones, or at least his likeness, break dancing. But this hip-hop commercial is Jones all the way. After all, if they were going to fake it, you'd think they'd get someone with at least a little rhythm.
Obviously, the whole thing is done with tongue firmly planted in cheek. It shows that Jones has a sense of humor about himself -- and it actually is kind of funny. He even establishes a bit of street cred -- OK, that's going a little overboard, but he does use the word "yo" twice and employs some old school hip-hop poses.
And, unlike other people who had no business trying to rap but did so anyway, Jones doesn't embarrass himself by attempting to rhyme "soy latte" with "double shottie" (Madonna), rewriting "Snow White and the Seven Dwarfs" hip-hop style (the "Saved by the Bell" gang), rapping the alphabet (Elmo) or convincing himself he's an actual rapper (Vanilla Ice).
But, still ... let's not encourage him.