Speed on the concentric parts of his lifts is astounding, no stretch effect either, woah.
Stretch reflex begins to dissipate after about 0.2 seconds but can be held for at least two seconds in trained athletes. Just because he isn't dive bombing the eccentric doesn't mean he's not using a stretch reflex. Not that's he's any less awesome!
Chapman, A.E., and G.E. Caldwell. The use of muscle stretch in inertial loading. In: Biomechanics IX-A. D.A. Winter, R.W. Norman, R.P. Wells, K.C. Hayes, and A.E. Patal, eds. Champaign, IL: Human Kinetics, 1985. pp. 44-49.