I really do NOT know the figures, but I thought Tesla's only charged the cells to 80% and discharged to 20% to save battery life. If you are doing a one off test, you could go from 100%-0% to get 40% more battery life. And the article talks about fancy chemistries, but then says:
"As a proof of concept, however, the prototype pack used in the demonstration was powered by different cells. The capacity of more than 200 kilowatt-hours was provided by high-energy cobalt-nickel cells, while those intended for the Gemini line are still under development."
So they used what might be normal high capacity cells. Maybe their battery has fewer structural components so they can fit more cells in. Maybe Tesla uses a different chemistry for longer pack life.
It seems like anyone could get maybe 40% more range doing nothing at all by simply fully charging and fully depleting the cells, and if you took the highest possible energy density cells and shoved them in to the same space with less structural members, maybe you could get the rest of the range they claimed. In fact it seems like that's what they did.
But that's not an innovation if the pack will wear out in a year, or weaken the structure of the car.
Like I said I am just speculating here and I don't really know, but so far this doesn't actually seem like the company has anything special. I have a feeling that if Tesla wanted to, they could do the same thing for a single demo, but that they have competing engineering requirements that mean they don't do this in production.