The link offers no proof, but that's somewhat understandable (I wouldn't want to dox myself either after such an event). If the claim is true, I hope they find an appropriate way of broadcasting it with credibility.
You might be able to seek a criminal complaint (not that I recommend it). You can call your local DA's office to see what they think. It's unlikely they'd want to take on Tesla, but a CA DA might go after the driver for criminal negligence.