His reasoning for this to work is that an average person is not going to react like a trained fighter. Problem is this stuff would be even harder to do on an "average person" because it going to most likely be wailing away. Plus getting hit in the balls mounted isn't going to get a big reaction that he thinks. Just like punching up you aren't going to have the power to do anything other than be annoying, especially with adrenaline running.
And here is the real question. Why do these "street" guys always think they have come up with something better than the tried and true. If it works on trained combat athletes then its going to work on an average person regardless of where you are. This pokey pinchy BS is less reliable than bump, trap, roll, now I'm on top and can pass guard or drop bombs.