Maybe there are some seriously messed up neighborhoods that I don't know about. But even Wal-Mart has a perfectly good array of healthy choices -- I've seen organic free-range chicken & grass fed beef at plus all the veggies (fresh & frozen) that one needs. Any other grocery store has even more options.
I mean, if the only store in a 10 mile radius around your neighborhood is a 7-11, then ok maybe this article has a point. Otherwise, you're just making excuses.