It's easy to make these 800V systems totally safe. You just have to combine this idea with the extremely sensible plan to put data centers in space and then there will be no worry about when "someone pulls out a rackmount unit" because there not be someone within hundreds of kilometers.
The concern isn't keeping people out of the facility altogether. It's keeping people safe when they are hot swapping dead or outdated rack units.
You could consider a robotized approach, but for now robots aren't very good at this type of task. Whether the robotized system is in space is irrelevant. It's not a "next five years" type of solution.
