Sure. Looking at each of the external sphere holes, each seems to be associated with a triangle of connected internal sphere holes. The central point of each sphere is therefore associated with the central points of three others in an adjacent plane.
It is easily possible to conceptualise the 'grate' of this mac-pro as a set of interlocking tetrahedra of origins of the spherical spaces, instead of interlocking tetrahedra of the joints; a little like a photo-negative.
I dislike the appearance myself, it provokes a mild feeling of trypophobia, but I don't see anything dishonest about their term.
> The simplest form of space frame is a horizontal slab of interlocking square pyramids and tetrahedra built from aluminium or tubular steel struts
Do you see anything that looks like that?