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The angle at which air flow starts to leave is important, and that is as claimed; 27 degrees. However, the mindset of a designer says this is a 15 degree fastback, not a 27 degree fastback.
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Here's another flow video, with the same "average" inclination,but a flat slope of 18.4 deg. note that the flow just barely starts to become detached. The lesson here seems to be that the air likes convex, or positive curvature, shapes. and is less happy with flat ones.
Of course this is only in 2D But it does reveal how dynamic the whole thing is.