Anybody with a basic knowledge of statics could tell you this is a hoax.
What they want to make it look like is that they are going to take the vertical load from one side of the structure and with help of the diagonal supports put that load down on the other side of the see-saw, presumably to make the see-saw tip to the side opposite of the ball location - which if it worked would make the balls endlessly roll back and forth.
What is wrong about this is the diagonal struts will not transfer the vertical load component without introducing a moment (rotational force). The offset of the vertical load will cause a moment (twisting force) at the point where the diagonal strut connects to the see-saw, which will actually lift the opposite side as if the strut had come straight down. That moment force is borne by the see-saw which resists bending in response, and actually pivots around its balance point just as it would have if the force went straight down to the opposite side.
Said simply this structure is no different than one where the weight of the ball run came straight down on the see-saw, in terms of whether or not the balls would roll by themselves. They would not. The only difference is the diagonals introduce moment which is taken up by the bending of the various members.
So without seeing the strings, or the guy under the table reaching up to tip it back and forth, the statics of it are impossible. Fun puzzle tho.
