I mean, based on the image, it does say the caffine content prominently up front. Just doesn’t run around saying “EXTREME” or the like on it, and I dunno how many people have a feel for how many milligrams does what, because other stuff doesn’t normally indicate caffine content like that.
I’d never bothered trying it at my Panera’s, as I prefer zero-calorie drinks, but I didn’t think of it as being an energy drink.