7/7 over 32 hands, I'm not considering him nitty as fuck just yet, more likely card dead. I expect him to have A9s 89s 9Ts 88, all hands that could easily check behind river when they could call. There's plenty more 9xs he can have too bvb I suspect.

I'm not a fan of c/c river because I don't expect him to value bet anything worse. I'd only c/c river if I felt he could bluff, but what missed draws does he have?