Only Apple could get shat on for using appropriate but obscure terminology.
> 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?
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.
I think pretentious is the right word.