C'mon. You know what he meant. He was using "digital" as in "digital distribution".
Sorry, i wasn't sure if he knew what he was talking about, he didn't even know where to get CDs. And i don't blame him. CDs are obsolete. People who still want a physical medium buy vinyl again and most people are satisfied with downloads.
Increased resolution across the entire audible spectrum.
Which you don't need, because of Shannon-Nyquist, which enables you to exactly replicate the entire audible spectrum with double the sampling rate, so 44k is more than enough.