From personal experience and diet over the last two years I agree with this report, however, I also agree with you. Unrefined, organic oils have made a difference in my health albeit along with everything else I do.
A study like this would most likely find that the kids that ate the healthiest fats, also had the healthiest diets. That would indicate more than just the omega-3s... could be a media plug for the 100's of processed food products that are to be launched with omega 3s in them.
Too many "studies", including this one make correlations and use way to many "can" and "may" and "could" which in essence says nothing...