It should never be the fault of the pedestrian if a self driving algorithm can be programmed to avoid objects in their path. Which is essentially what the entire car is designed and engineered to do.
The laws of physics won't be denied. You can't stop that mass on a dime. Even with the best programming and sensors, you are still subject to the real world, and people stepping out in front of vehicles that can't stop in time is one of them.
To that end, I'm not saying that is what happened here. The video would certainly help identify the cause.