Well, the comment "you cannot outrun a bad diet" is clearly referencing the bottom 95% of the population in this case, especially when followed by referencing "thirty minutes of jogging." Clearly exercise burns calories so it follows that there is some amount of exercise that will allow a person to "outrun a bad diet," so pointing out some edge case isn't helpful or instructive.

And then we wonder why even the simplest statements in advertising need a paragraph of fine print asterisked onto them....

So the statement should be 'it is easier to not eat a bad diet than to out run one for most people, including those who over eat for more complicated reason than hunger'. But you lose the sound bite quality. It is like pointing out the grammatical mistake in a punchline.