I think a lot of people mean "Wedding DJ" or "Radio DJ".
However there is a whole small subculture around this. A friend would go hunting for records to sample in Charity shops for old vinyls (this was pre-ebay). This apparently is known a "Digging" and lot of Music Producers, DJs etc would do this to find samples for their sets/albums.
Most arguments against gen-AI are bad arguments - you can (and should) admit this even if you (like me) don't respect gen-AI.