In the test model shown in the video, the arm shaped like a rhino horn is vibrated forth and back by a mechanism driven through a motor at the rear.
When this concept was tested, it managed to wander several inches without any reaction with the ground (see video).
This was all that was needed to prove the concept technically viable, which should revolutionize air and space propulsion.
Although the motor used is too weak and the design is still too rudimentary, the non-reaction wandering confirmed beyond doubt that the idea is practical.
A more powerful motor will produce more elaborate results.
The vibration can also be achieved using solenoid motors in electric versions.
This propulsion concept should reduce space launch costs, making it more affordable.