Yeah, I’m guilty of formulating this badly. I really wanted to know two things: is this something people have been saying? And if so, where does it come from?
The reference to the ‘10%’-thing was just as an example of something that’s being repeated a lot, but which doesn’t seem to have a clear origin.
Anyway, it doesn’t seem that this is something in wide circulation, and might in fact just be made up by that guy on YouTube. Either I’ve seen a reference to that short somewhere, or I just made the notion up myself and the short just accidentally happens to make the same claim.