But neither PCM nor DSD have a “sound” in the first place
Look, a recording engineer may not be the best person to ask about the technical aspects of a digital format, just as the engineers who design a digital format may not be the best people to use that format to make a recording.
I was at a highly-regarded and well-equipped recording studio in Berlin over the weekend. The senior mastering engineer there is convinced (as are the other engineers) that the new power cables he has installed in the main mastering room to feed their ATC SCM110ASL monitors and subs make an obvious, audible difference. I challenged them on this, asking whether they'd taken measurements to confirm what they'd heard. They of course hadn't done this, but they had "blind" tested the cables, with one person switching between cables while the other listened. In the first few minutes they'd got a couple of positive results, no doubt influenced by the knowledge of the tester, who was already convinced before they did the "test". They are now convinced of something that is frankly near-impossible.
I don't pretend to understand a lot more about electrical engineering than they do, but I am confident they are wrong and that I could design a test to show it.