Car did better than the driver. AEB kicked on ~2 seconds before the crash (which suggests it was not in AP mode, or was overridden) and driver was uninjured.
Its obvious Autopilot was not being used by inspecting the video. Near the beginning of the video, the car nearly crosses the passenger side lane line (even though there is another vehicle in the adjacent lane) and, for the duration of the video, the Model 3 hugs that lane line, something that Autopilot would
never do (it is programmed to stay centered in the lane).
So, what we have here, is some good old fashioned driver inattention. It happens thousands of time every day, kills thousands every year, and only makes the news if it's a Tesla. So we get some free advertising showing how safe the Model 3 is. Look at how far that truck jumps on impact! And the driver had not a scratch!