I think that the main purpose of the article was to pose the question "what makes an image a photograph?".  In response to that question,  I think that a photograph is an image that captures a reality, whether it is an earthly reality or a reality of the mind.  Something that is real to one photographer may be completely fictional and unrealistic to another.  Photography is all about perception, so what some may consider a photograph, others may consider a creation of the imagination.  As the article states, photography used to be about giving answers, but it is now about posing questions.  Photographers that push the boundaries of reality in their photos are the ones who are "redefining photography", and I think that many of the old-fashioned photographers are having a hard time coming to terms with the new form of photography.  It is them who question whether these new images are photographs, and that is why I believe the definition of a photograph is based on style and perception.