Don't be ridiculous. Have you ever tried to buy food on a minimum wage budget? If you want to eat anything that has even a modicum of nutritional value, minimum wage won't get you much.
I'm not suggesting that expensive/organic food is worth it's price. Nor am I suggesting that minimum wage should be raised to the point where everyone could afford to shop at Whole Foods. But if you honestly believe that the author is wrong when he writes "it's still difficult for people working low wage jobs to afford food", then you need a reality check.