This isn't complete bullshit. A Thai boxer will use your body to change the direction of the momentum of his leg, if the kick doesn't push you away. But are you telling me the Thais haven't yet discovered the left-right-left kick combination? I know this to be false because I myself have kicked people with such a combination as early as 1992. I realize this may be a bit slow in comparison to the ancient and venerable history of TKD, but it did seem familiar to my instructor too. A thai fighter would simply not notice being kicked like the video people do it, except as an opportunity to drop them with a right cross.
These Korean art stylists use the momentum of their roundhosue bouncing off the target to generate power for another roundhouse coming in the opposite direction. The opponent may block the first, even the 2cd, but the attacks come so fast they will begin to land hard.