The BQ claims/results hardly surprise me - fat tires don't have a rolling resistance penalty, aero isn't very significant under 20 mph, and weight is weight (the article basically sidestepped weight). Seems to agree with most of the recent "real world testing" that's come out.
The most surprising thing was that the pedestrian $54 650x47 WTB Horizon was only 1.07 kph slower than the $84 RH 700x28 extralight with latex tubes at 400 watts - this is at 38 kph+ where I thought the fat tire would have more aero impact.