Yes you can obviously use a closed loop system and scale up? it's even becoming the standard? https://datacentremagazine.com/news/how-closed-loop-cooling-is-reshaping-data-centre-design
That is a massive goalpost shift. You went from can't do anything useful to couldn't have discovered the problems in one step?
Why does it even matter if it can't discover the problems if it can solve them, exactly? And why could it solve the problems and not discover new ones?