Earlier quoted context omitted.
Yeah, they're attempting to do a time shift with some sort of echo-y dithering going on. Since it's digital, no dithering is needed!
Indeed. The sound starts off with a dialtone slowed down 700x but pitch adjusted. Guess what, that's exactly equivalent to the real dialone. (Instead of recording it for 1 second, you record it for 700 seconds.) This rest of the video continues in the same manner. It just doesn't make any sense to me.
If you are only analyzing the component noises there's a good chance you'll miss the emotions evoked, similar to the way a joke isn't funny if you dwell too much on the explanation.