I see - so your therapist did not need to talk to you about the causes of being overweight since they are irrelevant to you.

The premise of your "if these tactics worked, no one would be overweight" is that body size is solely dependent on the amount of food intake. The premise is incorrect - body size depends a lot on genetic factors, age, type of food consumed, illnesses and medications, hormones, exercise and movement, duration of sedentary activities, possibly bacteria in the gut and many more known or suspected factors, plus unknown factors. In other words, even if everybody could talk himself or herself out of eating cheesecake by talking to said cheesecake, people would still be overweight. Even if the advice in this article were easily implementable, a lot of people would still be overweight. And in a way, it is not so bad - overweight people outlive obese and normal weight people.

Your reaction to this article as well as the OP's reaction to the article about "mentally strong" people is valid and correct - you both reacted negatively to the trivialization of issues, and rightly so because trivialization not only is useless but is also condescending, often to the point of being offensive.