That’s an odd way of putting it. Lots of things are assembled by hand, on large and small scales. It would have been more impressive to me if they had somehow built a special machine just to assemble this one cube.
I wonder how small of scale such a cube could be made? Tiny graphite cubes might be able to slide against each other at microscopic scales, but at a certain scale it might be impossible to use any pigments on the cubes.
