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It's not so much that they need that much downforce at 250 mph. They want usable downforce at 100 mph and they happen to have enough hp to go 250. The faster you go, the lower the Lift coefficient you need. ie. 100 lb will keep the car on the ground regardless of speed.
The Colani Corvette has a Cd of 0.19, and went 254 mph with 770 bhp. The whole car is an inverted wing.
In many cases, hennessey in particular, they're not designers or aerodynamicists. They slap together a bunch of available parts. He copies existing designs and slaps on twin turbos and a wing.
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“Soft shapes follow us through life. Nature does not make angles. Hips and bellies and breasts — all the best designers have to do with erotic shapes and fluidity of form.” - Luigi Colani
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