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Tesla might have erased the problem with active suction to bend the boundary-layer downward just aft of that peak.
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'Active suction' is well known (outside journalism
) as
https://en.wikipedia.org/wiki/Coanda_effect. I see no indication of air vents.
More likely an electric plasma actuator.
https://en.wikipedia.org/wiki/Plasma_actuator
You find a similar [passive] angle break on a bullet boat tail.
https://duckduckgo.com/?q=bullet+boat+tail
The A-pillars are laid back enough to not be a problem. The real problem would be the refractive index of the glass. Everything has fresnel.