That's a fairly reductionist take from your side.
Did you even look at the article? I'm not trying to defend AI, but it's currently somewhere between 0.31% (2023) and 0.98% (projected for 2030) of freshwater use in the USA. Animal agriculture is at 40.60%. Plants for immediate human consumption are at 23%.
Combined with the fact, that meat is less efficient in converting farmed area or water to calories (In the USA 72% of calories are provided by plants, the remaining 28% are some form of animal product), this should also give you the answer for "why not go into any of the other water intensive crops we grow in the wrong place", which you asked in this thread.
Put all this together with the rising per capita meat consumption world wide and you see why we have a problem. In the USA most aquifers are drying up, including some very important ones for agriculture. And that problem has existed before data centers sprung up everywhere.
And yes, we could and should change agriculture to reduce water consumption - by reducing animal farming. In the best case getting rid of it. Even with people that can't survive on a plant based diet, which I would expect to be very few, we could reduce animal agriculture to close to 0 compared to our current level.
And this is only talking about the water usage of animal products.
And the best part - it doesn't cost anything. On the contrary, it would be cheaper. It doesn't even require new technologies! Going vegan is degrowth in action.