I completely disagree. In my experience, the most knowledgeable people are the ones who are genuinely interested and curious and crave more knowledge, no matter what. You could convince them that they were the most knowledgeable person in the world, and that wouldn't prevent them from learning more.
> You could convince them that they were the most knowledgeable person in the world
I agree. I'm just saying that the challenging part (especially for those with impostor syndrome) is actually being able to convince them they are the most knowledgeable person in the world.