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I would add that in the video, they are not discussing rolling resistance, but instead, how "fast" the bicycle tire is. A bicycle for racing typically does not have suspension, and can be "faster" by reducing cyclist fatigue, or by allowing higher speed cornering, or many other factors even if that comes at the expense of a tiny amount of absolute rolling resistance. Maybe I'm confusing the their terminology but from how he was describing his testing procedure it seemed he was looking at lap times, or sprint times.
Although it wasn't stated explicitly, I gather that as some point, rolling resistance improvements diminish sufficiently as to not be "worth" the additional harshness and vibration.
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