I disagree. This doesn't do anything except bring more attention to the fact that they had widespread cheating in their alliance. No one is going to believe their innocence or guilt based on this topic since, as saeton mentioned, this is exactly what you'd see from someone guilty. I am not saying that this makes them guilty or that I think they are, because frankly, I have no clue, but they would have been better off simply staying silent and answering any questions they received in private.
Of course they probably had another reason for making this topic as well...