He's being self-deferential, by pointing out the silliness of the story that bumped him off. The whole "He's calling her fat" thing is spread by people not paying attention.
Of course, its also possible he's enthused about her badonkadonk.
He's not even saying "she's a tubbo." He's basically taking the piss out of the magazine. "Oh yeah, I heard she has a weight problem. That's WAY MORE IMPORTANT THAN THE FUCKING PRESIDENT."