It's a sensible reply when you don't want to be accused of holding onto IP that you don't own.
I have kept source code from many projects that I've worked on but if some stranger asked me for details about any of them I'd give the exact same response.
At this point the company that bought the company that bought Ensoniq is gone, so it's hard to imagine who would come looking for 12kB worth of 6809 assembly code.
I have kept source code from many projects that I've worked on but if some stranger asked me for details about any of them I'd give the exact same response.
It could also be the complete truth.