Autopilot could kill the engine and lock the brakes without turning itself off. By turning itself off and giving control to a human mere instants before a crash it’s effectively ensuring the engine isn’t turned off (as there’ll be no time to do it before the crash, and the human may not be in a fit state to do it afterwards).

But more to the point, regardless of whether there’s a good reason for it to do that or not, it shouldn’t be used to claim on a “technicality” that autopilot wasn’t active “at the time of the crash”, as clearly it meaningfully was at all points leading up to it.

It is giving control of the car to the driver without enough time for a human to react to anything. I understand why there’s nothing the autopilot can do but then blaming the driver for not fixing the situation in the 200ms they have is stupid.