In this case they could be investigating if NoA malfunctioned. If NoA exited the freeway and didn't slow down/stop at the end of the exit it could have contributed to the problem.
But of course the driver was responsible as AP is a driver aid not a driver replacement until FSD is released and approved to be a independent driver.
@️ELECTROMAN️ @printf42 @mars_or_bust What part of that you disagree with? That the driver is fully responsible or that the NHTSA is likely going to be investigating how AP/NoA contributed to this collision? (Surely you can't think they are just investigating why somebody ran a red light and hit another car do you?)