Yes, anyone's raising range would be pretty wide on the river in this small pot. If I was in opponent's place, I would raise a ton of hands.

Now time for a little over-analysis:
Your only job is to estimate if his call-3bet-shoves-on-the-river-in-small-pots range is wide enough that you're going to profit in the long run vs the few times he does have 89. Its a pretty easy assumption in this hand, but something to keep in mind in future hands.