Errr.. remember that HPE recently merged with SGI. So have access to the SGU Numalink interconnect, which is used to construct really, really large proper NUMA systems.
It would look to me like HPE have used the Numalink chips on ARM boards.
I'm speaking as someone who has managed Origin 200, Origin 2000, Altix 4000 and Ultraviolet systems over the years, so I might just have a clue here.
