These are very fine ways of explaining simple things in an ego-boosting manner. The more you work with ML these days the more you appreciate it. It happens with every new technology bubble.

In regular terms he's saying the outputs aren't coming out in the same dimensions that the next stages cn work with properly. It wants values between -1 and +1 and it isn't guaranteeing it. Then he's saying you can make it quicker to process by putting the data into a more compact structure for the next stage.

The discriminator could be improved. i.e we could capture better input

KL Diversion is not an accurate tool for manipulating the data, and we have better.

ML is a huge pot of turning regular computer science and maths into intelligible papers. If you'd like assurance, look up something like MinMax functions and Sigmoids. You've likely worked with these since you progressed from HelloWorld.cpp but wouldn't care to shout about them in public