It's probably along the usual lines of power quality. Wouldn't surprise me if the excuse given is that traditional hard disks introduce more electrical noise on power/data lines, which effects the quality of the power/data going to the audio circuitry of whatever audio card being used...
....the same sort of people who notice differences between expensive optical/coax digital audio cables and cheap ones, and the different a high quality/expensive power lead and a stand for the hifi makes it all sound so much better.
Unfortunately my ears don't appear to be good enough to discern any difference myself.

....the same sort of people who notice differences between expensive optical/coax digital audio cables and cheap ones, and the different a high quality/expensive power lead and a stand for the hifi makes it all sound so much better.
Unfortunately my ears don't appear to be good enough to discern any difference myself.
