Okay, I guess I can see that. Would have been clearer if they just said what they meant. I live somewhere (not in America) where having 3 kids and hating kale means you look normal. It isn't some code for "very overweight".
The idea is that distorting images, logos, or text end up with bad proportions, which the original designer did not intend. Scaling an image of a human wider does not create the illusion of being fat.