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They mentioned the wheelset choice in their statement of limitations.
The comparison is also not fair because they're using an aftermarket aero-specific rim brake versus a standard disc brake setup and they're using a 160mm front rotor instead of a 140mm.
They also appear to have tested without hydro lines or brake cables which would certainly make a difference.
hippy
@svenhöek
Damon Rinard/Nathan Barry/Cannondale Bicycles shared data from a windtunnel test of a bike with no brakes, rim brakes, disc brakes.
http://www.slowtwitch.com/Tech/Disc_and_Rim_Brake_Aero_Drag_6073.html
the comparisson between the rim brake and disc brake results is a bit unfair because the test uses the same wheels (with and without rotors attached). So a better rim brake setup would be with narrower nondisc hubs + 4 fewer spokes in each wheel.