I think what he is saying is they'd want to hear something overwhelmingly obvious, however, the beginning of doubt starts with noticing an error in one of the details of the assumption, which most of the time are subtle.
"The important details you haven’t noticed are invisible to you, and the details you have noticed seem completely obvious and you see right through them. This all makes makes it difficult to imagine how you could be missing something important."
I think what he is saying is they'd want to hear something overwhelmingly obvious, however, the beginning of doubt starts with noticing an error in one of the details of the assumption, which most of the time are subtle.
"The important details you haven’t noticed are invisible to you, and the details you have noticed seem completely obvious and you see right through them. This all makes makes it difficult to imagine how you could be missing something important."