It's says in the article the handbrake automatically engages when it dies. So it's essentially pushes a multi tonne dead weight.
Not that it explains what took so long for it to be moved.
Though if memory serves Tesla are a bit funny with this sort of thing.... If it (as the article suggests) was a problem with the car.... Tesla basically say if someone else does anything to the car, the warranty is void, but if "we" do it we'll recover it free.
I'm surprised no one tried bouncing it out of the way. I know that's what the fire brigade sometimes have to do if a car is blocking them getting to an emergency.