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Those single person "holograms" aren't 3d. They offer a perspective shift that tracks a single point on your head, and look great in video, or with one eye closed, but are 2d when viewed with the eyes. For 3d, you need to give each eye a different perspective.

These holograms are 3d, since each eye is presented with an image that matches its own perspective.

Good point. Although if you combine this with 3D TVs, then you basically get a single person hologram, right?
Only for one person though which isn't a great thing for TVs which generally have more than one person watching. Also the tracking is a bit of an issue, you'd have to wear a little headset to accurately track your head when they were released. Now you could maybe get away with using a camera for tracking but now you've got the privacy worries of that happening.
Yeah, that's how this system works, using eye tracking instead of a goofy game controller strapped to your head ;) https://www.cnet.com/tech/computing/sonys-5000-eye-tracking-...
Sony recently launched a product based on this concept: https://electronics.sony.com/spatial-reality-display/p/elfsr...