It's very difficult to get away from this, but Ivey has been giving indications about the strength of his hand with a bet out of position on every street. However, he might do this with another hand too as a bluff.
The question to ask then is, how many times will he be bluffing
here and how many times will it be for value. There is also the possibility he could be playing with two pair, which would beat his aces already, but there is less chance that he would be playing those cards out of position. If he would be in a late position two pair would be a risk but here not so much, which makes it more unlikely again that he would have a hand.
I don't think he would be doing these actions with for instance TPTK, but it is a possibility. The calls from Cunningham might have slowed him down with that hand, so I wouldn't think he has that either.
Very nice fold and I think most players would call because they have two chances: he is bluffing or he has a good, but less good than aces (like KK).