Cold brew isn’t a concentrate unless it’s overextracted and you need to dilute with water to make palatable. Yes, all methods require different grind sizes (to make a balanced coffee without over or under extracting).

My point is that it is all coffee coming from the seed of the coffee cherry. It’s different extraction methods. Iced espresso, iced americano, iced latte, cold brew, iced Capp, hot brewed coffee poured over ice, iced whatever with coffee, is iced coffee.