The difference is that the humans in the cars behind will be able to see that too and anticipate the reason for the braking. In this case, the Tesla just changes into the leftmost lane and then brakes very quickly to a stop for no apparent reason. A human doing the same thing would almost certainly be at fault too.

You can see on the video that it's not just suddenly stopping, it's changing lanes (with what appears to be very little room from the car behind) and then suddenly stoppping.