The first part of the video the bus is stopped but no red lights flashing; the angle prohibits the sight of the arm extended.
Passing a school bus with only yellow lights on is legal in FL. If the road is undivided then all lanes of traffic must stop- if there is a median then only the traffic on the same side is required and expected to stop.
I drop my sons at a bus stop nearly every school day. people ignoring the bus flashing lights is rare on my stop, but it does happen in other places.