That's a really good point - you're right, comparing data center usage to potable water usage by towns is a different and more valid comparison than comparing with water for irrigation.
They made a good point, but keep in mind that they're doing a "rules for thee, not for me" sometimes.
The same person who mentioned potable water being an important distinction also cited a report on data center water consumption that did not make the distinction (where the 628M number came from).
