They interviewed 310 ppl, calculated their BMI, then found out around half skip breakfast. That half had BMI a little higher than the rest. No discussion of what they eat. What a waste of time for everyone involved.
And BMI says nothing of body fat percentage Can have higher BMI and lower bodyfat I'm not convinced BMI is a useful metric
That might not be the case individually but with multiple people the few outliers don't matter.