If you look on their website (https://www.aerominetechnologies.com/) you can see there is a downward facing turbine hidden underneath

Motionless in the sense or they do not have to be facing the wind at all time.

From what I've seen it does not move. In my area winds come from the north and east, so it would work one direction but not the other. Also, how does the wind channel into the main duct?

There is a turbine at the bottom. It just redirects the wind down.

Calling it "motionless" is truly bizarre.

Based on the video, there's definitely internal movement.

You can see the moving part on the video. It's just internal to the duct.