Without reading the article I already have so many questions. Why all this speculation!? How many doctors who have learned how to cook does it need to test this hypothesis and aren't those easy to come about.
I see that as a refreshing break from the usual pattern of naive "if there are numbers (no matter which) it must be true"-empirism that holds the medical profession in a stranglehold. (even the antiscientific alternative medicine people do most of their arguing by blowing numbers out of proportion, people rarely become doctors because they were particularly good at maths)
One of the point of the article is that doctors that can cook may be able to give nutritional advice to their patients that they can relate to, and that does not get too abstract.