Each channel inherently ends up coming in to the other channel, attenuated and reversed in polarity due to the mechanical arrangement. Seems to me this is something dsp could potentially address to some degree.
It says it can also fix the "cross talk". You know when you hear very quietly in the background the next phrase as the record does the next rotation, it’s the stylus picking up the next rotation groove through the vinyl V wall before it gets to it’s proper groove. (I think they call it adjacent groove talk)
As well as giving a "flat frequency" response.
But to me the "channel separation" is a more difficult one, as I don’t think the dsp knows what’s the reference is for this to give it better separation.
Cheers George