Previously, you endorsed this position:

Never try to deceive yourself, or offer a reason to believe other than probable truth; because even if you come up with an amazing clever reason, it's more likely that you've made a mistake than that you have a reasonable expectation of this being a net benefit in the long run.

One counterexample has been proposed a few times: holding false beliefs about oneself in order to increase the appearance of confidence, given that it's difficult to directly manipulate all the subtle signals that indicate confidence to others.

What do you think about this kind of self-deception?