No. It's not in the eye of the beholder or the mind of the MO's general manager. Ginza is a district defined on the map. It's not an arbitrary region with poorly defined borders. I don't doubt that you can find lots of websites that list MO as a Ginza hotel. That's because the hotel has put out some misleading information.

2km. That's not a 10 minute walk. Are you being deliberately obtuse just to wind me up or do you really think the MO is a Ginza hotel?