The original paper that started this meme said "data centers consume water indirectly through the water used for electricity generation" and then counted water evaporating out of Lake Mead behind the Hoover dam as water use. This made the numbers seem gigantic, people got mad at it on social media, and 1 year later here we are.
https://www.sciencedirect.com/science/article/abs/pii/S09213...