Ah yes, thank you very much! Karma coming your way. I had read that essay and seen pg's comment. However, I didn't notice his implication that he wasn't willing to talk about most criteria because they could be faked/gamed. Kudos to you or whoever spotted that. However, I don't believe he said it was the only one he would discuss.

I am very sympathetic to their need to keep some of their cards private. While I and others might just be looking for a little constructive criticism for its own sake, no doubt there would be some who would try to use the information to portray themselves as something they are not or hide something that would hurt their chances. If this reduces the amount of feedback they could provide to a level where it wouldn't be helpful or makes it a complicated and risky affair, then it's reasonable to just avoid it altogether.

I am not sure why they wouldn't just say that though. Perhaps to avoid catalyzing attempts to identify and game their criteria?