How do you get "it isn't useful" out of that? If you have to extract a wild interpretation out of what (I thought) were pretty clear words, your argument isn't as strong as you think it is.
And yes, I read the article. It's speculative for existing data centers, which are the problem. There's no incentive for them to spend the money to switch to closed loop.
New data centers aren't incentivized to go that route either aside from the environmental impact. It would be nice if they were, though.