I think if you know where you're going because you've been there before, it probably works a lot better. Otoh, if that was the case, you wouldn't need to work backwards anyway.
The first thing I try to do is get my levels as close to 0db on the faders and a fairly even volume for all the tracks. The middle down mixing??
Though they probably do that first, and then start on the buss effects and call it top down.
If it prevents you from starting with a kick track, tweaking and effecting the heck out of it, then move on to a snare..., then on to a vocal track and the same tweaking and effecting, it probably does save a lot of time and futility by having to go back and re-tweak some more because something isn't working. But you have to know what effects you are going to use on whichever buss or you can't really do that. For example, if I put a Sonnox Oxford Inflator on the stereo buss, and tweaked all my tracks with that engaged, and then wondered why I was using that and took it off of the stereo buss, I'd have to start over maybe, or put it back on so I didn't have to,lol! However if I knew I always used a Sonnox Limiter on the stereo buss, why not?
That's what seemed to be left out in those videos, the presumption that you would naturally already want to do, this, this and this. Cut here, boost there, add this... because of this, but if you were just tweaking by ear and didn't know beforehand, you might cut wrong, boost ridiculous, and totally make a mess of everything.
Maybe I'm missing the point?? That's entirely possible!