I agree my summary was a bit breezy. But I think an essential component of their theory is the focus on domain knowledge and metacognition, not skill as it is normally used. Consider the title of their first paper: "Unskilled and Unaware of It: How Difficulties in Recognizing One's Own Incompetence Lead to Inflated Self-Assessments". In the conclusion, they write, "We propose that those with limited knowledge in a domain suffer a dual burden: Not only do they reach mistaken conclusions and make regrettable errors, but their incompetence robs them of the ability to realize it."
Anyhow, for those who want their full take, the original paper is here: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.64....