You may be right about this being one of the first digital recorded pop releases. Regarding classical music Denon was a frontrunner from 1972 onwards (from the late 70`s in co-operation with Supraphon) .... and the earliest jazz digital recording goes back as far as 1971 (!!)
https://www.discogs.com/de/release/9408907-Steve-Marcus-J-Inagaki-Soul-Media-Something