I thought the same thing and was especially shocked that the technique could ever be used in the Siberian taiga (both because of the cold and the dense vegetation). Compare this to a quote from the above wikipedia article "Scientists, posit that early tracking methods were developed in open, sparsely vegetated terrain such as the Kalahari Desert in southern Africa."
Between the barefoot hunting and the persistence hunting, this story seems like it's tailor made for Born to Run.
Well it's an endurance method vs a distance method. "Run your prey ragged" I guess. You could do that on steep mountainsides just as quickly (perhaps even more quickly) than open plains. You'd just need to not lose site/sound of them in the dense forest which should be doable.