So, after having reviewed the videos again, I have a theory about what may have happened.
Again, I’m just speculating here, and am probably 100% wrong.
So watching the video from the inside of the car, the other BMW is trailing, for most of it, and seems to pass the Toyo vehicle moments before the impact.
On the first video that was released, you can see where the Toyo vehicle is in front, and the 2nd BMW overtakes him. At this point they both pass a vehicle in the middle lane and the Toyo vehicle moves to the right.
If you look carefully it looks like the back left of the vehicle its seems to shift to the left slightly, like it went over something, or hit an oil spot, he then tries to correct it and at that speed can’t react fast enough and ends up hitting the barrier. Interesting to note that the driver side hits the barrier and the vehicle does a 180 before going over the barrier. So the passenger side also took a significant knock