I've read the article. It asserts that treatment according to Watchtower policy does not pose an increased risk FOR THE SPECIFIC PATIENT PRESENTATIONS REVIEWED BY THE AUTHORS of this study.
There is such a thing as bleeding to death. Current Watchtower policy would have a JW succumb to death rather than prevent that death by transfusion of blood and products rendered from blood on its forbidden list (red cells, white cells, platelets and certain plasma products such as FFP). This study does not dispute that fact.
See: http://marvinshilmer.blogspot.com/2012/03/stark-reality-facing-jehovahs-witnesses.html
And: http://marvinshilmer.blogspot.com/2012/02/more-than-50000-dead.html
Preventable death due to Watchtower's blood doctrine is well documented! Very well documented!!!