9.5 PFR makes me think he'd raise an A2 preflop most times, so I'd expect to pick up the low w/ 2nd nut usually. Hence, turn call is fine.

River call is definitely correct, since board pair together w/ your aces often counterfeits his higher two pair.

If the guy has nut-nut, chalk it up to bad luck; everyone catches a cooler now and then.