I had that discussion in person, so I can't point to comments. There may have been some confusion about the claims made, such that the claim I understood them to be making is different from the claim that they made, and the specific game in question was 2-iteration PD with the nonstandard payoff matrix (50,50; 100,0; 0;100; 25,25), but I think they were using cached thoughts for the discussion, rather than something that applied to the specific case but not the general.