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I’ve used one of those before at an airport and it worked exactly as you say. I think it was just for boarding though. I just walked forward and when I got to the front, they greeted me by name and I got on the plane. I don’t remember having to show my passport or boarding pass that time either (but it was last year so I may have forgotten).
This is literally the 80s version of holding up your phone to record a video of a music concert.