Hand Tools Archive
I used the term back stop in the article posted on here. As far as your asking the question, I don't know if it's related to the 80 degree cap iron angle where the shaving was further from the edge. It's been too long since I watched the video.
There is some influence on a shaving before there is so much that it straightens. Or to be clearer, there is some reduction of tearout without having to straighten a chip.
I usually (99% of the time or more) set the cap iron so that it will straighten out a significant shaving, but not do much to a thinner one. I only set it closer in the rare instance that a shaving between those can generate some tearout. A "back stop" setting that keeps you from doing what you can encounter with an errant stroke of a single iron plane - huge tearout pried off the surface of the wood.