So, in the abstract, they say they controlled for "lifestyle" but then the researchers are paraphrased in the article as saying "This is an observational study, which means the data cannot conclusively prove that coffee itself lowers the risk of dying; there may be other lifestyle factors contributing to that lower mortality risk among people who drink coffee, like a healthy diet or a consistent exercise routine."

On the one hand I get what they're saying about their own study design, on the other hand, it might be good to get more info about lifestyle vs lifestyle.