I with Maurice Greene. The bottom of a deadlift/sticking point of a squat, has the far greater strength and power if you hold it there. Don’t you agree?.
Again, in a resting position (finish of a deadlift/starting point of the back squat) your not training your body to recruit the greater amount of motor units as opposed to a starting point hold (Deadlift) off the floor, a sticking point or at the near bottom (squat).
I would imagine, depending on the weight used, he has increased the intensity of the exercise considerably. Even if his thighs were resting on his calves at the bottom?, its still more of a considerable feat, than standing upright with the weight just on the shoulders.