I think it is a factor in why he is so fast. When he only focuses on two colors, he spends less time looking for a cross, and spends more time planning his cross and F2L. IT could be why he is able to plan so much in inspection.
I think nearly everyone agrees that CN provides a benefit, but here's the question we should ask: How much is the benefit compared to the time and energy needed to master it?
Since it takes months to become CN I would say there are other skills with much higher benefit-to-cost ratio. Improving lookahead, turning speed, learning algs, etc