One of my cousins naturally toe-walked similar to the video at least into his teens. Of course his mother wondered out loud "What type of sport is that good for?", and at the time I didn't have an answer ready to fire at a moment's notice.
Myself, I naturally heel-walk and rather heavily as well. You can imagine the wear-pattern on my shoe soles.
Shoe wear is an interesting investigate tool. The most easily observed wear, sole wear, is the result of friction due to foot motion relative to the ground, not force.
Midsole compression and heel counter distortion better correspond to force pattern, but they are integrative and themselves affect gait.
Myself, I naturally heel-walk and rather heavily as well. You can imagine the wear-pattern on my shoe soles.