A good friend of mine at Google is the technical lead of this project (he has a Phd Princeton, and was a professor before joining Google). I've tried it in person and it was truly amazing. They used some very fancy tech when I saw the demo, so I'm thrilled it is finally being announced and possibly shared with a larger audience. Explanation of why it is amazing: It totally fools your perception. No glasses or goggles…
Isn't it just the "Pepper's Ghost" technique? https://en.wikipedia.org/wiki/Pepper%27s_ghost
The marketing for it is pretty terrible though, because I initially came away with the same impression as you.
[0] See image here: https://www.engadget.com/google-project-starline-191228699.h...