This is a terrible article that completely treats depression as the fault of the individual. Pretty irresponsible frankly.
Seems more like a failing of our society to recognize the importance of relationships. I'd argue this is especially true in the US where we obsess over careers and monetary wealth much more than we emphasize the importance of friendships, family, and romance.
Considering how little we understand about the brain and psychological disorders, it seems premature to dismiss the article so easily, especially when the author is a practicing psychologist and presumably has had some level of success with his methods.