@sadono, I have some power cords that the manufacturer cryoed. I also made come power cords that I had cryoed and after a long break-in, in my opinion, I preferred that flavor.
I have no idea if the Oyaide power cords are cyroed or not. Does anyone know for sure?
If they aren't cryoed I'll bet that cryogenically treating them would be a good thing, but one never knows until they try that favor.
On a slightly different note I received my TUNAMI GPX-R V2 power cord and currently have it on my cable burner along with a Matrix power cord.