If true, they would need current energy sources at first to pump water and do whatever separation they need, but once they are producing, they can burn their own fuel and not need fossil fuel energy.
So then part of their production has to be used for production which lessens the output. Still in all though, they’d have to produce millions of gallons of the stuff for the US economy to survive on it. Then too, you’d have to use the product to transport the product. Anything involved with production and transportation has to be with that product. No fair using bio-fuels like ethanol.