This study also opens up questions about previous studies that have found cardiovascular benefit by replacing animal fats with PUFAs -- those studies did not control for the fact that people were also increasing omega-3 PUFAs.
Do we know everything there is to know about how omega-6 fats affect our health? Of course not. But is the notion of an optimal ratio of omega-6 to omega-3 a myth with absolutely no data to support it? Hardly.