Ahh, there's the key "over the entire power stroke" which means the force/draw curve is a flat line, no build up, no let off.
You got it! The maximum amount of energy you can have for a given peak weight and a given length of power stroke is a flat force draw curve. That's why I qualified the answer with peak weight, brace and draw length. When you define peak weight, draw length and brace you have defined the maximum window to work in. Of course your right it's notshootable. Not only that it isn't buildable either. We can only approach it as a limit.