The car is obviously the on in the wrong, but it potentially was a “nearer miss” than it needed to be.
Watch the video.
Truck driver puts signal on and moves into lane 2.
Silver car joins lane 1 and then you can see it starts going to lane 2.
There is then quite a big delay between where you can clearly see the car drifting into lane 2 until the truck starts braking.
Perhaps he was making a point to car?
Was he not watching properly?
Either way, like I said car is clearly the one in the wrong but the truck could definitely have reacted sooner preventing it from being as close as it was.