“Re-centering” = Lawyerese BS
Lane splitting is dangerous. I’m surprised it is legal anywhere, but this was California which explains a lot.
Police reports are not always accurate, but they are under pressure to assign blame so they do. Therefore, lawsuits happen.
The whole incident boils down to this, IMHO:
The computer incorrectly assumed that the spot that it vacated when it attempted the lane change would remain vacant. The motorcyclist incorrectly assumed that the car would complete the lane change and stay there. Both were wrong, both share the blame.
This could just as easily have happened with a conventionally operated car.
Check out YouTube for some California "bike adventures".