The usage metrics for energy that support his argument came from Sam Altman. And this is also terrible reasoning in regard to water usage, because it doesn't really matter that the prompts are only 0.3ml. Since the rest comes from generating a response. Also, it's 0.5 -1.5l of water not 2 ml. Because again he's using AI tech oligarchs as his source, in this case, Google. So the water usage is minimized by several orders of magnitude.

However, that 2 mL of water is mostly the water used in the normal power plants the data center draws from. The prompt itself only uses about 0.3 mL, so if you’re mainly worried about the water data centers use per prompt, you use about 300,000 times as much every day in your normal life.

https://www.profolus.com/topics/ai-water-consumption-2025-rivals-global-bottled-water-demand/