Sorry, but I don't see Chad referring to eccentrics at all when discussing the size principle and it's not in your quote.
Stop looking things up on the net and quoting them here, it's pathetic!
What you have just described is a good plyometric rep, which does not work the muscle fiber part of the MU as much as the neural connection. The increased force is from a neurological reflex, not MU recruitment. Plyometrics have not been show to cause any increases in muscle CSA, only increases in strength due to increases in neural innervations.
Now run along and search the net for plyometrics.
Ps - If that is you in your avatar, you might want to wait to offer strength training advice until you weight at least 150lbs! "