Originally Posted by
ThatT1Feeling
I would argue that 9B in this case is an exit row seat. You can hop it quickly leftwards and backwards to get to the exit. I agree it's not what most of us would think of as an exit row and it's therefore misleading on legroom expectations, but there may be a definition nuance that we don't know about.
Crew may also think that despite not officially being an exit row that in the panic of an evacuation people may decide to go that way anyway and if they do better to not have them falling over bags and blocking the exit.