Pretty sure you're incorrect about the C5 Z06, never came with magnetic ride control as far as I reember. Adjustible valving, yes, but not magnetorheological.
And Delphi's system was developed earlier and a version of it was available on the 2002 STS, among other cars, but you know good and well there are several generations of difference between that and what was developed for the ZR-1..... which was prior to the CTS-V, as I stated.
It was on the C5, especially the Z06. Which is why I was even floored that CAP mentioned it at first. The MagneRide was on the 09 CTS-V and is more than likely the beginning of the implementation of the same on the Camaro. The ZR-1 is not the "test bed", it was the Buicks, Holdens, Audi's (cost effective) that were the "test beds". Not much tweaking is needed between them. I can tell you this much, there are different grades of it and there is no way in hell the ZR-1 factors into this discussion. The CTS-V, probably, but not a $100k+ car. Yes price point will most definitely give you a good barometer.
All I am trying to bring real world things to this discussion. If it is a pissing match others want, I will walk away laughing.