Thats a good point.
I also don't think he would be "foolin'" with the SW unless he was getting something substantial from it.
He's pretty pragmatic about his gear and what he chooses. Sometimes he looses, like in the original C-2 where he had that Neutrik knock-off and Cura had his way with him. On the BS Continuum, you have AMB and Cavalli, and Gilmore and A-GD in my opinion on one end and ALO and RSA on the other, with others falling along these two extremes.
So back to my point, if he wasn't getting something substantial from the SW changes, he would leave it alone.
Typically I'd agree with you, but given that many people (even on the chinese forum) said its a substantial difference, I'm inclined to think so. Thing is, if this was a hardware change like new caps, or better power supply, I'd say forget it because such changes make marginal differences. However, because the change is to the DSP algorithm I feel the possibility for change is substantial as the data is being manipulated; phase, etc all changes. FYI I do not own any A-GD product at the moment.