What does that have to do with them not being school trippers? If anything, school trippers can bunch up easily due to kids ringing the bell when no one's getting off and shit like that. I feel bad for these drivers having to put up with stupid nonsense like that.
Also, as far as I know, CS still has the Q76 route and the one in the picture is a QV bus but JA and QV both do school trips for various CS routes so one can put two and two together.