It is pretty obvious the cause, they are just doing their investigation. There is a video of it out there. I will describe it for sensitive people who might not want to actually see it. The car was going probably 100 mph out of a tunnel and understeered into a jersey barrier. The passenger was ejected still in the seat and the car caught fire a few seconds after impact. Bystanders managed to pull the passenger away from the wreck, then the video cut off.
Did you see the speed he was going on a public road? LA drivers are tired of these assholes driving recklessly. It’s gotten incredibly dangerous to drive especially at night after COVID.