I am not sure if I am missing something, since many people have made this comment, but isn't this in some ways similar to the shape of the traditional definition of back pressure, and not "entirely different"? A downstream consumer can't make its work through the queue of work to be done, so it pushes work back upstream - to you.
Yeah, I spent way too long trying to think of how what the author was talking to was related to back pressure... I had a very stretched metaphor I was going with until I realized he wasn't talking about back pressure at all