As has been said, I don't think they fold KK-Tx otr given the action so far. If you want to rep an A, do it ott but if you are called ott I think it's unlikely you get any folds otr (with this river card).
I would tend to agree that 99 rarely wins otr when the hand is checked down. This would have to be MP cbetting overcards or an underpair, and BB c/c overcards or an underpair otf after the cbet and your call, which is rather unlikely if he is a nit. Plus the flop overcards in their ranges should have no A.
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