How can you people even consider this not to be illegal? It is a movable aero device! If there was no performance advantage would they go to the trobule of manufacturing a structure this complex?
If any of here has experiance with composite manufacture, you will understand just how much more difficult it would be to get consistent performance (flex) from the wings. They are not doing this so show off their manufacturing skills!
From the footage it may not be too visible but I feel that they are applying a 'skew bending' phenonion. A practical example of skew bending is to carry a long (4m+) 'angle iron' extrusion on your shoulder and you will feel the twist of the bar as it flexes.
If you apply an 'equivalent' areo load a distance from the centriod of the wing profile you will achieve skew bending, which could (will) lead to a decrease of the A.o.A. thereby reducing drag.