I think he's referring to the not-so-well known secret that is unnamed but very helpful. Basically, if you push from behind and hit the enemy RIGHT as they pick up the ball, they lose it.
The Top push is bad, it will only push him forward and he will retain the ball. Yeah, that should be obvious. However, in the second push it can totally throw a player off guard and its hard to get all the time. I know I'm not that great at it, but it really helps turn the ball possession. The Pink lines shows that you will collide with him, even if its only slightly, but at a MUCH more favorable angle.
This is just the concept.