Hub centric

I've been looking at the Mopar Action magazine article. I understand the concept but when the tapered seat lugnuts are torqued on the wheel, what would a ring accomplish. Seems to me that the ring could do nothing since the lugs and tapered lugnuts hold the wheel solid on the hub or axle andnin only one possible position. What the heck am I missing here? If the ring is made of some really hard metal, perhaps torquing the lugnuts might push (bend?) the lug studs sideways or something but I question that. They're pretty tightly set in the rotor or axle flange.

Jerry