You keep replying to me with one-sentence posts that say little and have no point. If you have something to say or a point you're trying to make, I'd prefer you just do that rather than trying socratic-method everyone to enlightenment.
To (try to) answer your question, to the best of my ability based on limited information what your question even is: no, it is not about detecting when that update should be performed. Remember that we are talking about brain states, i.e. the-world-as-you-think-it-is, as it is represented in your mind, and perhaps if you want to push it, as you are consciously aware of it. If you hold conflicting beliefs but you are truly ignorant of the fact, then you can't really be said to have cognitive dissonance. In Bayes terms, I guess this is analogous to having priors, but not being aware of how to evaluate them based on evidence, and maybe even that you should do so in the first place. Cognitive dissonance, on the other hand, would be having priors, knowing how (and when) to update them, doing the update, and then ignoring the results. Alternatively, it would be performing faulty updates and being at least partially aware of the error in doing so.
To (try to) answer your question, to the best of my ability based on limited information what your question even is: no, it is not about detecting when that update should be performed. Remember that we are talking about brain states, i.e. the-world-as-you-think-it-is, as it is represented in your mind, and perhaps if you want to push it, as you are consciously aware of it. If you hold conflicting beliefs but you are truly ignorant of the fact, then you can't really be said to have cognitive dissonance. In Bayes terms, I guess this is analogous to having priors, but not being aware of how to evaluate them based on evidence, and maybe even that you should do so in the first place. Cognitive dissonance, on the other hand, would be having priors, knowing how (and when) to update them, doing the update, and then ignoring the results. Alternatively, it would be performing faulty updates and being at least partially aware of the error in doing so.