I think you miss the point of the linked article, which is not that we are "not very good" at introspection, but that introspection is literally impossible. We don't have any better access to our own brain processes than we do to a random persons. We don't have little instruments hooked up to our internal mental mechanisms telling us what's going on. I fear that people who think they do are somewhat fooling themselves.

That doesn't mean we can't have models of ourselves, or think about how the brain works, or notice patterns of mental behavior and make up better explanations for them, and get better at that. But I think calling it introspection is misleading and begs the question, as it conjures up images of a magic eye that can be turned inward. We don't have those.