That's just him being Donald, though, because at the same time he says it, he then goes into how healthy he is, how he just took another physical and how he's going on Dr. Oz to discuss how good his health is and release the numbers.
It's his passive-aggressive way, to stoke the flames, but later deny that he did. Like every time he's repeated a lie he "heard" in this campaign, but then said he didn't believe it, he was just saying...