I haven't watched the video, but if the silhouette in the screen grab for the video is supposed to be a squatch, the proportions are human, not squatch.
I've seen shelter structures in out of the way places ever since I was old enough to notice them back in the late '60s, so they've been around all along. It's just that people have actually started looking for them now. No mystery about why everyone and their brother is now reporting them.
I've seen both standing and disassembled structures. The reason they always stood out for me is that kids used to disappear in the areas of Northern Nevada and Northern California we frequented. It always made me wonder who was building them, living in them, and then taking them apart in the cases of the disassembled ones. They always made me equally nervous, considering that they were either occupied by some off the grid human or a squatch. Usually the structures were non-permanent, sometimes just the logs and branches, sometimes with smaller branches with pine needles and leaves overlaid to cover the gaps. It wasn't hard to tell after the second glance that they weren't natural deadfall (logs and branches from other areas). One of the things that puzzled me to begin with was the complete lack of trash and other leavings that would indicate human occupation. Hobos, as we used to call homeless, aren't the neatest people.
With regard to the stump inside the mound of branches you found, MIB, it was a heated shelter. A rotting stump is like a compost pile and evolves heat, especially ones that are infested with carpenter ants (snacks). You build a mound of branches over it and you can trap the heat, especially if you use a second layer of leafed branches and other vegetation to close the gaps. Snow over that helps even more. I've been telling people for a while that bigfoot likely use compost heating, or midden heating, during colder months. The middens reek. The squatch reek because they sleep in reeking shelters.
The BFRO website a couple of years ago had an investigation of a whole bunch of decomposing stumps they found and thought had some relationship to squatch. I don't know if they ever thought of the compost heating angle.