It’s a deeply unsatisfactory situation, because on one side we expect evidence for such a serious accusation, and on the other side we know such evidence is all but impossible to gather retrospectively.
I believe the takeaway is exactly that. We are in a situation where we can’t know for certain. We can’t go back in time and learn if there was cheating going on. But we can go forward and increase security so the next time we are more likely to be confident about if cheating happened or not. And that is what Carlsen is asking for.
No, that's all he has said thus far. You don't have the faintest idea what he "can say". In fact, Magnus hints that he has more to say, if GM Cheatboy gives him permission to do so without threat of a lawsuit.
