If you watch the video carefully, the expy stays together fairly well. What makes it so dramatic is the lack of seatbelts. I'm not an expert, but I think a seatbelt would have probably saved a life in this extreme rollover crash, but that is the purpose of the video, to show the importance a seatbelt plays, even in a high speed multiple roll over crash. I wish there was a link to the same experiment with the dummies seatbelted in.
I did that in an F-150 extended cab. Rolled 3 1/2 times. Ended up on the roof. We were going about 55 mph. Thank God we both had seat belts on. I was the passenger. I can still remember how hot the roof was getting as we rolled and slid. We went over passenger side first and it sucked!! First roll was pretty slow. The second 2 1/2 were a lot faster. After the first roll I though damn we are OK. Then is was s#!t we are going again. My side was flat with the door jam. I did a lot of ducking. I climbed out the driver side rear window. My co-worker was stuck in the truck because he could not get the seat belt undone. We both walked away with minor injuries.