No idea! I wasn't really aware of Classic at the time, but I do suspect that piano sales must be a very small world and sales people know each other and move back and forth quite a bit.
At least two of the folks I had talked to showed some kind of plaque with their name on it, which made me think the title was personal rather than associated with the shop. But while I had very little interest in diving into specifically what the award was, I did wonder in the back of my mind if there were different categories of "top sales" by # pianos sold, or # pianos bought, or highest rating by customer survey, etc., Or if there were separate awards given by Bosendorfer Ltd. the distributor or Bosendorfer Inc. the US operator (these are all just fictional constructs in my mind).
I just kind of assumed it meant "you're good at what you do," which honestly doesn't really matter to me much since I'm looking to buy a piano, not a salesman!