Georgewhitt
Winger
Any team you are playing against on a given day is a rival.The key here is it mentions the word "rivals" as part of the definition. The players aren't rivals, except from being in the same division. The fans aren't rivals because they have limited to zero interaction, with the exception of folk like yourself.
Boros location makes them a local rival.
Therefore by definition it is a local derby.
Look at the actual defintion I copied man.
You may argue until you are blue in the face, but you are trying to put your definition, with your rules, on to something that has already been defined.
You are wrong.