Sorry to crush your dreams bro, but that's gonna be per m2. If your growing outside, and the weather is beautifully perfect, then you might be able to reach 300-400. Also they will always post "optimum" results, if THEY grow it themselves they MIGHT be able to achieve theses results. Yield will ALWAYS be dependent on external factors, the plants genetics cannot reach this size if their owner plants them in a double cheeseburger. They are looking beautiful though, how long into flowering are they? Also how big is the tent/light?
Happy Growing
TC