To me this feels like a case of unconscious bias: I think many people who interview genuinely believe they are looking for some set of criteria {A,B,C} but they're evaluations/recommendations actually reveal a bias towards {X,Y,Z}. So as a candidate, after you've been interviewed enough times you realize that X,Y,Z is really the name of the game and posts like these just seem totally out of touch.
* I wonder if anyone has tried introducing some kind of control group or blind study mechanism where some small % of candidates are actually secretly employees of the company. Probably would be hard for in-person interviews because people might be recognized, but maybe more practical for phone screens. The trained decoy candidate could basically attempt a problem in exactly the same way for many interviewers and then data could be analyzed on the outcomes to detect what biases are present.