The difference is "datacenter equipment" has changed - it used to be large rack mount servers that, while a bit silly to run at home, at least could be done if you wanted to spend the power budget.

These are entire datacenters build for one thing - and they're water-cooled and integrated so tightly that it's unlikely you can do much with any parts or part of the setup.

The difference between buying an off-lease Dell server and trying to buy part of a supercomputer - which is what these really are. They're not datacenter; they're custom-built supercomputers.