You are completely missing my point. I know F1 cars don't exceed 200 mph because it is more valuable to have the downforce in the corners--that was the point I was making. Downforce equals drag, which takes power to overcome . If an F1 car gets more power, the team will use that power to increase the downforce rather than increase the top speed. Hence why no F1 car exceeds 200 mph. Granted this all goes out the window if you allow active aerodynamics, which is why F1 bans it.
But THIS car is clearly sacrificing downforce (and therefore handling) in order to achieve a high top speed. Remember, downforce=drag. In order to achieve a top speed of 248 with only 750 HP, you have to have a very low downforce car. Which is stupid unless you are at Bonneville. You could get around this with active aero, bu there is no mention of this in any of the articles.
A Bugatti Veryon takes something like 300 hp to cruise at 200 mph in low-drag mode. It takes the remaining 700 to push all the way to 250. You are vastly underestimating how much more power it takes to increase your speed, at high speed. Drag increases by the square of velocity.