My take on the video. At 1 second the bike is in the left lane, left tire track and behind the car. Neither a mirror or blindspot check would likely see him. After the car puts its turn signal on, the biker accelerates to beside the car, still in the left tire track. Car might be able to see him in the mirror, but not with a blindspot, and the driver would most likely be doing the latter at this time. The bike isn't passing and can't pass the car, because of the left lane bandit truck. You'll note that neither the dashcam car or the white car in the passing lane, get closer to the issue area. There are mistakes all around, but most appear to be on the biker from my point of view.