I have never used it but it definitely looks like another technique to practice and have at you disposal if the time comes where you might need to use it. Thanks for the link demonstrating this technique.
last month we were training and unknowingly used this technique, It was nice to see the link and i can show everyone what we did vs what they are showing . they were very similar, and some issues (questions ) raised in the post drill critique were addressed by some minor changes to what we were trying. Additionally check the fireengineering .com site for some othe advanced extrication techniques in they're traing video section