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Without knowing if this has anything to do with these glasses I remember something called „in eye projection“. The trick is to create the image with a laser direct in the eye ignoring the focus distance, line a hologram. A quick search shows something like this https://www.osa-opn.org/home/newsroom/2018/october/optical_d... .

Just have an eye projection made through some aperture narrowing lens system to flatten the depth of field

The optics mentioned will project the light so the display appears to be much further back, and your eyes have no trouble focusing on that virtual image.

I worked with Sony SmartEyeglasses. Yes, it is possible. There are many many ways to achieve that.

Oculus Rift display is also pretty much up close your face, but you can focus.

With that I thought there are lenses between eyes and screen that make it possible. With smart glasses I couldn't see any opportunity to alter the visual rays.

// Thanks for other comments how it could be possible!

Well, that's to give a familiar example. I don't believe most people are familiar with waveguides whereas VR headsets are widely available these days.