I also took note of that statement. who doesn't hold on with one hand now and then especially after a long ride.
People who don't ride motorcycle, or even bicycles, don't understand the physics involved in how easy it is to drive in a straight line with just one hand while in motion.
I do it often once I am going the speed of traffic and my arms or back need to be in a different position for a few minutes. It really helps for long trips.