It is neither faked nor a scam, I have seen this tech first hand in the previous incarnation as CastAR.
What you see is simply the consequence of how the system works - the glasses contain a miniature DLP projector that shines light on a retroreflective surface. That reflects it back where it came from - i.e. towards the glasses (and the camera!). That's why the camera sees the image outside of the glasses too - it is exactly aligned right in the path of the light. You could see the same with a naked eye if you looked carefully from the right direction.
The glasses themselves are only so that you can see a stereoscopic image, nothing more (i.e. the image isn't produced by some sort of an LCD). They originally used shutter glasses, I think they now use polarized instead but not 100% sure.
Another pointer that this is legit would be to look who is actually behind the company. If you don't know who Jeri Ellsworth is, then I strongly suggest that you google her up.
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/xwink.gif.pagespeed.ic.cldandycH0.png)
Actually Mike has done a teardown of the early developer version of the CastAR glasses:
The current version is a lot improved since then but the basic idea is the same.