I had similar concerns, what new breed of superdocs are they hoping to create, considering that doctors before them certainly did have some level of meal preparation ability? But fortunately the article is more nuanced, i read it as "when general household skills are in decline, young doctors may be bottlenecked by that when talking about nutrition, some cooking classes might help".

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)

What is well documented beyond any doubt is that nutrition is more important for your health than nearly anything else in life, so there is no doubt that getting his patients to eat more helthy food is one of the most important things a doctor can do.

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.