Really? Did you not notice that cars park along the shoulder of the road? He was just far enough into the lane to get passed the van, but what appeared to still be in the door zone. If he moves further in after passing the van, chances are the cars will block him in and not allow him to safely get around the next car which will be along the shoulder. Also, I don't know the law in California, but in Florida, if you have two lanes going in the same direction, a cyclist is allowed to take one lane.