Well, I'm not going to vouch for this picture, but I wouldn't be so quick to say 100% of "gut shot" deer are going to die.
The story behind this picture was that an individual shot this deer one year, and a friend of his shot the deer (and killed him) the next. There was still a scar on this deers back, but otherwise seemed OK.
No matter what, it makes me a little more careful field dressing a deer.
BTW, read John Trouts book on Finding Wounded Deer, an intestine hit requires much more then 8 hours.