Interesting topic. I think it depends on intent. Whats presented in the article i personally see morally problematic as you pretend to be dumb with the intent to not have to bear some load, relying on the goodwill of others, disregarding the value of their lifetime.
However, if you hide a feature you have in order to not be solely judged by it, its more difficult. I.e. a prince hiding his lineage or an artist hiding his craft.
A good measure is probably, to ask yourself if the other would feel betrayed if you told the truth.
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