There are plenty of peer reveiwed studies out there that flatly state that cryogenics works, going all the way back to the original work of Dr. Randall Barron. The work of Dr. David Collins is magnificent. The afformentioned studies by IIT, Los Alamos National Labs, and the US Army Aviation and Missile Command, The University of Trento, Italy and others all state the process works and works well and works as advertised by the more responsible practioners. The American Society for Materials, International says it works. The Cryogenic Society of America says it works. What do you want, a new book in the Bible about it?
Your studies point to a conclusion that everyone is making. We do know it works, we do not know why. But your conclusion seems to be that you do not know why it works, therefore you are skeptical that it does work. Does not knowing why something happens mean the process should not be used? Show me any study that shows how gravity works. Do you distrust gravity? In today's competitive market, we need to use every advantage we have. And this process provides a HUGE advantage in tooling performance and in component performance.
You need to separate having to understand a process from being able to profit by it. Until the early part of the 20th century, we did not understand why steel got hard by quenching and tempering. That did not stop us from using hardened steels. We did not understand exactly why airplanes flew for the first 25 years of flight. (The Wright brothers observed the way wings created lift, but did not have any idea why they created lift. Their work was strictly empirical.) But not understanding how the aircraft worked did not ground all aircraft. And people watching them fly began to see that it was no illusion.
People who refuse to use cryogenic processing because they cannot explain its mechanism are not being rational. The research by careful, prestigious organizations is overwhelming. The practical uses are overwhelming. We are beyond the point of being skeptical about WHETHER it works. If you want to help us find out why cryogenic processing works, hail and welcome. If you want to denigrate the work of learned researchers with an opinion, then don't waste our time.