An interesting hypothesis. I visited PubMed in order to find the paper this article discusses, and got no matches, so the paper is likely still waiting to be printed. However, that means we may not see the exact methods employed by the researchers. Seeing as the achievement of the subject of the article includes many factors that are poorly accounted for (such as mood and the level of happiness with one's partner, whether the study subjects are married or unmarried, et cetera), methodology is a concern.
I agree. Seeing how they came to their conclusions would be interesting. I personally don't believe every gene theory that seem to be offered up on a daily basis. There seems to be a trend toward an almost worship of DNA which I do not think is justified overall.