Ick. The typical Pittsburgh pizza is a provoline/mozz blend atop a sweet sauce and a usually undercooked medium thick crust, no char. Cheese is the thing here, sauce is second, and few places make a decent crust. It's not good.
I'm wondering if they mean "Ohio Valley Style" which is that ludicrous Grandma-style pie which is baked with just sauce and maybe some parm/romano mixed in, then cold toppings are added, supposedly to melt into the pizza. IMO, it's an abomination, but it's got a number of places offering the thing out in the Pittsburgh/Youngstown/Stubenville triangle.
Or maybe they put french fries on top.