IDIOT STUDY!!
It is the ratio of omega 3s to omega 6s that is important. Where does it say that their diet was controlled for omega 6s? Which would be impossible to do if they were freely eating. Also the total amount of PUFAS (all industrial seed / vegetable oils) counts too. They should only consist of what would occur in natural foods like pastured beef, eggs.
Some older clinical studies[46][55] indicate that the ingested ratio of omega−6 to omega−3 (especially linoleic vs alpha-linolenic) fatty acids is important to maintaining cardiovascular health. However, three studies published in 2005, 2007 and 2008, including a randomized controlled trial, found that while omega−3 polyunsaturated fatty acids are extremely beneficial in preventing heart disease in humans, the levels of omega−6 polyunsaturated fatty acids (and therefore the ratios) were insignificant.[56][57][58]