The question was about the present, not the future. Maybe Musk will be able to lower the price of batteries in the future, but his current price is pretty much what I said. What he has achieved is to make lithium batteries about as cheap as existing consumer batteries, not even as cheap as the sodium-sulfur batteries that power companies use at the moment, let alone what is necessary for widespread deployment.
The question was about the present, not the future. Maybe Musk will be able to lower the price of batteries in the future, but his current price is pretty much what I said. What he has achieved is to make lithium batteries about as cheap as existing consumer batteries, not even as cheap as the sodium-sulfur batteries that power companies use at the moment, let alone what is necessary for widespread deployment.