The video is literally evidence of the effects of following too closely. From the back angle, there are 4 vehicles starting with the white truck in the leftmost

The video is literally evidence of the effects of following too closely. From the back angle, there are 4 vehicles starting with the white truck in the leftmost lane that pass through within 1.5 seconds; a few are only a few hundred milliseconds apart! If you switch back to the front view you see that’s exactly the cluster that piles up onto the safety braked vehicles ahead of them, because the white truck they’ve been tailgating has swerved into a moving lane and exposed the stopped traffic. Everyone beside perhaps the first car that had an incursion into its lane (but arguably failed to reduce speed to avoid an accident with a vehicle braking and signaling their lane) are WAY too close for the speed. Any speed reductions in those lanes would necessitate heavy braking which would cause exactly the ripple effects you’re referring to under normal conditions because there’s no buffer whatsoever to gradually reduce speed/increase distance either.