Michael: "Hyman Roth has been dying from the same heart attack for the last twenty years."

Is this just a cynical statement or does Michael hint that Roth is faking is diseases? Or does he just mean that Roth is extremely lucky?
On the New Years Eve he obviously has a serious attack. And when he says he can't take a piss without it hurting, it sounds believable. After all, he's a very old man.