I heard that too! I also have heard that he doesn't drink water because he's afraid that his body will get too soft from all the pampering.
I'm sure there are other elites in the past and even now who run their easy days at around 6 minutes or slightly below. Just because you can't keep your heart rate below 200 with that pace, doesn't mean it is difficult for him. And honestly, why do we speculate about how the elites train. The only people that know the intricacies of their training are they themselves and their coach.