But I still think that refusing to name a number shouldn't be the number one point in all of these discussions and blog posts about salary negotiation. You're right, when there are huge amounts of information disparity, either because a company's pain point is significantly higher than market rates would imply, or because a candidate has a rare and unique skill that cannot be easily found, then all of the entry-level negotiating tactics go out the window. But for fair-market jobs and candidates, I think you should be able to know your value well and refusing to name a number is a waste of time and energy.
Well, in the podcast, he mentions that this one action is part of a larger strategy. The goal of it isn't to get the company to reveal the cap, but to defer the question until you've demonstrated high value to them, see where they start, and try to find their cap from there.