The Controversy Behind Nike’s Vaporfly Running Shoe, Explained [Video] (youtube.com)

This seems more like a long Nike ad than an explanation of any controversy.

Also, having worked in a machine shop, I freaked out watching the guy operate the band saw.

Basically no explanation of how it works or why it's better. I suspect the extra thick foam sole and embedded carbon plate are acting as springs that return some energy to the runner as the heel lifts on each step. Kind of similar to those running stilt things that are basically bent carbon fiber sheets working like a bow.