Ahh yes, the tenuous link between confidence and dishonesty. It's true - the link is there, and it's not always obvious either. In Nikhil's original essay, he highlighted a hidden connection between confidence and dishonesty: instead of being honest about his insecurities, he's misleading others with theatric command in his vocal inflection. Indeed, confidence can come from genuine knowledge and experience, but it's the type of confidence that Nikhil is talking about that I'm referring to. With this kind of confidence, one is saying something that may or may not be true, but they're saying it with a certain air of authority - no matter if they have genuine knowledge or experience to back it up or not.
Furthermore, Nikhil was also spot-on when he said that being told to be confident can be interpreted as an invitation to lie ever so slightly more convincingly. This kind of 'confident' delivery of information can encourage people to misconstrue the truth - and the fact that this isn't always obvious makes this all the more concerning. So yes, overconfidence can be a display of truth and integrity... but UrRong if you think it's always the case. To be frank, it's often just a better-groomed version of dishonesty - and at the end of the day, it's still dishonesty nonetheless.