The truck still blocks the view of headlights of the traffic in the other lane. It also blocked view of the lights of the right-lane truck near the end. I don't

The truck still blocks the view of headlights of the traffic in the other lane. It also blocked view of the lights of the right-lane truck near the end. I don't know what the state of the art is like, but humans can tell something is "off" up ahead when they see this kind of "disappearing headlights" pattern. In any case, the tweet claims there was no braking of any kind, and I'd expect braking at least in the split second before the crash, where the truck is visible to the camera.