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You're conflating drag with drag coefficient. The plot you linked doesn't say anything about drag. Drag is more strongly proportional to speed than drag coefficient. That type of proportionality analysis is what's usually in the first chapter of aero textbooks.

Computers are great for marginal gains and saving labor costs, but they can't give a 10x improvement unless there's already a 9x improvement in materials and techniques. Small nit, but CAE is simulations, while CAD is just drafting.