That was the only video I saw with a quick search. My guess is that with a longer search, there are more.

Single wall tents are what high altitude climbers usually use, aside from at base camp where big double wall tents seem to be common. This is based on my reading and looking at pictures, not personal experience. The idea is that they are quicker to set up and lighter than a double wall tent.

My tent is a double wall tent. The inner tent has some big mesh panels that can be covered with zip-in panels and the outer tent is solid. The outer tent (commonly called a "rain fly") is a heavier material than the inner tent. I don't believe it would be any warmer than a good single wall tent.