weight loss is more a product of a reduced calorie intake or increased execise (net kcals compared to what you need.) . Not so much what type of diet your using. What type of diet you use will have more of an impact on how much fat and muscle you lose with your weight loss.

I should also note that after reading the article i would have to see the actual testing protocol to make my decision. I would guess that there were many things done during the testing.

You can loose weight on a caloric reduction diet for sure
but in terms of optimising body composition in terms of fat and muscle thats when you have to worry about how much of exactly what macronutrient u should be eating IMO

Also this is down to individuals on how well you handle certain foods and on your insulin sensitivity but a High carbohydrate diet is out of favour now when trying to cut up. Basically when you eat carbohydrates it creates an insulin response within the body. When insulin is released in the body because of eating carbohydrates, Your body goes into a state whereby it can cause fat storage. This doesn't mean you don't eat carbs, it just means you eat the right ones (Lower GI unprocessed) so that it reduces the rate of insulin (Glycemic Index)

Basically when you eat carbs they are broken down into glucose and stored in the muscle as glycogen. Any left overs usually spil into the liver and stored as liver glycogen. The liver is responsible for Turning carbohydrates into fat via Lipogenesis De Novo which means the carbs are stored for a later time as fat in adipose tissue.

In other words, Eating too much carbs isn't a great idea for overall body composition.

Hope i made sense lol

If you eat low glycemic carbs you will lose as much fat as any other diet. Low glycemic carbs dont cause the insulin spike.