To be fair, I think that's direct from the Police rather than bad reporting. The Police will report that the car drove off , as at this point they cannot reliably prove who was driving it.
They have arrested a man under suspicion of failing to stop because at the moment they will be trying to gather evidence that proves he was driving the vehicle rather than say being a passenger or someone who has taken over driving the car. It's a rather factual statement, but the Police do tend to stick to facts.
They won't say that he did it until there is evidence to submit to the CPS, and they have decided to prosecute.