I don't know if anybody commented on it yet, but the planned TWH level of battery production mentioned yesterday is not unrealistic. But it's a very long term goal, likely ten years out to get to the full TWH level, with an initial hundreds of GHW in five years or so.
One TWH is 1000 GWH. Current capacity is about 28 GHW. So about 35x as noted by Electrek.
Now, Tesla is producing about 400k vehicle run rate off the current 28 GWH capacity, plus some relatively small energy storage capacity. Ignoring the energy storage, 10x (or 280 GWH) would give about 4M vehicle run rate. Elon estimates Model 3 and Y to be about 1.5 - 2M. Add in pickup, S, X, roadster, and semi, that gets you to almost 4M, not counting further future growth or additional vehicles.
Tesla has stated several times that energy storage business would eventually be as big as vehicles. So another 280 GWH energy storage. That's almost 600 GWH combined in the future. So 1000 GWH (or 1 TWH) is not unrealistic, especially considering further growth in autos (beyond 4M vehicles) and energy into the next decade and beyond.