I don't think that's at all in conflict with the point of the article. Like you said, virtually everyone you meet has knowledge outside of your shared diagram,

I don't think that's at all in conflict with the point of the article. Like you said, virtually everyone you meet has knowledge outside of your shared diagram, so it's not unreasonable to think some of that knowledge could be relatively commonplace. If you extend that same humility to others (rather than unfairly assuming that you're just especially naive) then you're really coming to the same conclusion as the headline here in a more diplomatic way.