[WaitWaitWha]

... at 1:03 he hits steady 700W. At 1:29 shows they kept increasing the incline at least to 40 degrees. Why not keep it at the same incline? . . .

[herzigma]

It was hard to see from the video, but I suspect the machine he was on increases resistance as pedal speed decreases to try and keep him at a constant output.

That's a pretty common device for elite fitness testing.