Drive to the right edge of the road and stop until the emergency vehicle(s) have passed
That is a direct quote from the California DMV and from the sounds of it that's exactly what the autonomous car did.
The right answer, in my opinion, is to allow the first responders to take control of the car. This wasn't just a lone ambulance that happened upon a stationary car. It was a major crash (where a human driven car ran over a pedestrian) with a road that was blocked by emergency vehicles. A whole bunch of cars, not just autonomous ones, were stopped in the middle of the road waiting for the emergency to be over so they could continue on their way. Not sure why only this one car is getting all the blame.
I just actually bothered to read the article, and it sounds like it was an empty police car blocking the way between two Cruise cars that had pulled over leaving a space, and there in fact was a way to manually move them but it took critical time.
These cars get stuck all the time and are a major local controversy, so I'm guessing this was the click-baitiest headline they could go with. "Police officer carelessly gets in the way of paramedics" just doesn't have the same ring.