You would be surprised what done guys carry on them.
I used to carry a roll of duct tape and a multi tool when I had busses out of Yukon it was that bad. But never anything where they couldn't fold up the ADA seat. Maybe not move it correctly for a wheelchair but if it folds down it will definitely fold back up.
The picture makes me think the operator just did not know how to raise it up as it is slightly different than the local bus.