Probably not marked on the deceleration lane is a stop line, the second NB vehicle should not have entered the intersection with the first vehicle still there.Just an observation: Another van pulls in behind him aiming for the "correct" side. The intersection is now blocked. Totally. With just 2 cars.
Had the first car done it "wrong", there would have been no blocked intersection.
The SB vehicle should be stopped at the line and yield the RoW to the vehicle in the intersection.
If one party decides they know better, then the next two vehicles would enter simultaneously and potentially collide head on, if one opted for method B for bad.