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.