Their FAQ says: "In other words, and despite what your training buddies might tell you, you don't pull-up on the pedals. But that never made much sense anyways, did it, and we at Micro Sport are glad to clear up this common misconception."
HORSE HOCKEY! I know I pull up HARD on sprints and sprinter's hills. On extended climbs I'll often apply power only on the upstroke so I can rest the muscles used on the down/bottom stroke.