I can only offer my own interpretation of this in terms of what I call "Cognitive Dissonance."
I think this is a good analogy, though I'm no expert. The bias is called Overconfidence Bias because people tend to believe that their judgement is better than it is. The bias is called Cognitive Dissonance because people tend to believe that their judgement is bad as well.
The inference of cognitive dissonance follows from the fact that both groups of people believe that the average of their judgments is very close to the average of their judgments. If we examine this, we see that the average of people's judgments is in fact a relatively close approximation of the average of their judgments. On the other hand, the average of people's judgment, in the aggregate, is not very close to the average of their judgments. And that's the problem. People believe that their judgments are both very close to and not very close to the average of their judgments. Which, in turn, means that cognitive dissonance is in effect, and that both groups of people are, in fact, believing different things. Most people believe in their ropeflow training.
The solution is to get rid of the Cognitive Dissonance. It is very easy to get rid of cognitive dissonance. It's a basic principle of human psychology that human beings, especially individuals, can usually find solutions to problems that they find difficult. Humans are also good at solving problems where two solutions make up only a tiny minority of the total population. For example, the great majority of the human population has no hope of finding a solution to the problem of the extinction of the human species.