Tell me you don’t know how radiators actually work without telling me. They dissipate heat via convection through the air surrounding them or gasses in general. What does space lack a significant amount of?
Oh, you got me, turned it around. Oh dear, whatever will I do? Oh right, remark how you don’t know and should stop supporting a stupid idea in the first place.
To prevent any moisture that might be in the air inside the data center from condensing onto electronics. Admit it, it’s a stupid idea and stop defending it as a legitimate one.