I posted that earlier piece from the Rydstrom interview because it not only tells us what he changed but what he changed it from. He gives us a clue as to what the CDS track or the studio theatrical master, would of sounded like. He indicated that the CDS was created using a Dolby Stereo encoder/decoder to create a surround channel. That means that the CDS would most likely have mono surrounds. That's important to note because even though CDS supports full 5.1, Terminator 2's CDS track would be 4.1:

He also says in the interview, that in this remix he stereo-ized the surrounds. So all discrete versions before that interview would be 4.1. So when I check the Live/Artisan DVD's AC3 track:

it has mono surrounds. All the soundtracks after this DVD in the US have split/stereo surrounds (and EX, ES, etc). So that means this DVD came from either the CDS soundtrack, a Dolby Stereo master or the master used to make both of those tracks. It looks like Disclord was right (which he always seemed to be).

(Rydstorm also says he didn't change any of the sounds which I believe, since T2 has sounded the same in every version I have ever heard)