My interpretation: He tried some higher quality interconnects in his setup and the sound did change. But the change wasn't better bass or soundstage or whatever, instead the cables revealed hiss or noise that did not belong to the record but is a byproduct of his particular setup at that point in time (I take it that he used a reference recording and not just some old record where crackling noise IS part of the record). Moreover he wants to know why cables sound different and not just exactly the same (apart from proven scientific explanations).
Just saw all this! I agree with your interpretation, it boils down to the age old Head-Fi question, "do cables really make a difference?".