It's quite possible the supervisor or driver asked passengers to stand further back or go upstairs. In my experience, people will go upstairs and stay up there unless instructed otherwise even if there's no seats. It would be hard for the supervisor to see from off the bus whether anyone was stood upstairs. The camera would only show the stairs with the doors open anyway. I would be very surprised if anyone instructed anyone to stand upstairs.

I'd hazard a guess that this is simply a case of miscommunication. Those StreetDecks can carry about 100 legally and I highly doubt that you'd be able to exceed that - sure GNE have checked CCTV and Ticketer data which will probably confirm the bus wasn't overloaded - just people standing where they shouldn't due to miscommunication.

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