Oh, ok.
I did not know that.

Anyway. Still... good exercise to figure out at which sample size you can say with some confidence that he's only 3-betting AA, KK. The two crucial factors are: how often does one get AA or KK, and how often does he get a chance to 3-bet them. - The second part is trickier - maybe PT can help, otherwise just count it out. Consider position.