I have seen and used this technique in class, and it only illustrates the various uses of this "movement."
 
Dr. Benjamin Rush, 5th Dan
S.H. Kang's Tae Kwon Do Academy<<
Sorry, only part of my post made it. The above should be read, re- read and read again.
The so called "real applications" trend are a flavor of the month. Rick Clark notes in his real applications book that he has no idea what the real applications are. That was lost in antiquity (though some texts like Bubishi are around). He only notes that the applications he provides really work. His "75 Down Block" book contains numerous applications. Are all, none, or some real? Or, perhaps that focus is too narrow.
As General Choi notes, the most important training secret is to know the purpose / application of the technique. Yet that is only part of what he says. He often shows more than one application and states that you must understand the distance and angle. This is not a new concept ("Wax on Wax Off"). The goal is proper motion.
Toward that end knowing an application is but one tool in helping you understand the motion, and that is the point. The applications help you learn how to move in an efficient, well balanced and powerful manner. Once this is learned the motion can be utilized in any number of ways limited only by practical considerations. ("Pick up Jacket, put on jacket...")
Yet we still need to be careful that we are not so heavenly minded we ain’t no earthly good.
"Before I learned the art, a punch was just a punch, and a kick, just a kick.
After I learned the art, a punch was no longer a punch, a kick, no longer a kick.
Now that I understand the art, a punch is just a punch and a kick is just a kick."
-- Bruce Lee