I suspected this was about a singular case. Any typical pistachio farm doesn’t need anywhere near that kind of water.

Here we’d be talking about “the corporate name” in pistachios. That’s a very different thing from what “a” typical pistachio farmer needs. I submit the original comment is cherry-picking to make their argument.

A pistachio tree needs something like (on average) 60 gallons of water a day.

For one 365-day year that is 21,900 gallons/tree/year.

That’s a lot of water, of course. But most farms do not have in excess of 5.39 million pistachio trees (using the 130 billion gallon number).