I think that's a fair question, and that includes the text that says "Body seen in this area". I had tweeted at the author about it but hadn't gotten a reply (note: this may be because they don't see/reply to tweets from nobodies like me).
The distances, as depicted, are a little strange. If Uber AV hit the victim at 40mph, you would expect her body to be seen farther away from where it says "Body seen in this area".
How do I know this graphic isn't entirely speculative?