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It's actually a hologram - which is by definition a 3D image. I contend that my original title is appropriate. Holograms ARE volumetric displays. I can see why the researcher wouldn't want to call it that - claim you invented something better than science fiction = instant media coverage.

hol·o·gram noun A three-dimensional image formed by the interference of light beams from a laser or other coherent light source.

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As indicated by your definition, the 3d-effect of a hologram arises from interference of a coherent light source. In the display that is shown in the video, the 3d-effect arises from light-emission (scattering) of a point source that moves around. The light from the point source need not be coherent for this display to work! Therefore, the term "hologram" seems inappropriate.

I have never seen a hologram that is also a volumetric display. To me, this would be the holy grail of hologramming, since you could use interference for occlusion effects.

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