I doubt that tube dampers are like cryo. As for cryo, there may be something to it depending on how the metal cooled as the phase diagrams of the metal will show different metal structures depending on how it was cooled. This is why annealing, tempering and such work. That's the limit of my experience with this. But now that brake rotors and vacuum tubes get cryoed...geez, anything to get into the pockets of the consumer. At least some of that is work done in the US, a service industry country, we freeze stuff to sell it for more.