I recently upgraded from 6.5.5 to 7.0.1. We have also introduced a few new media servers, and are configuring them for OST. I ran accross some wierd output on an nbdevquery -liststs...
I see exactly the same thing on an NBU 7.0 test rig I have here. I suspect that it's purely hard-coded information in nbdevquery (strings nbdevquery shows a bunch of V6.5.5 occurances) and is probably reflective of a shared code-base between 6.5.x and 7.x.
Since storage servers also show up in this list (such as DataDomain), which don't have NetBackup Software installed, I certainly don't think it's reflective of the version it *thinks* it is running.