Not that I'd buy into too much marketing hype, but both systems (the dimpled topsheet and the "intelligent fibers") can work, just not exactly the way marketing says they can.
The dimples effect the vibrations running through the length of the ski. depending on their geometry and the material used, they could be very effective at damping certain higher frequency vibrations without inhibiting the low frequency "spring" responsible for lively skis, and lost using damp materials such as titanal. Nothing to do with aerodynamics, but it would be noticeable at higher speeds. I believe Fischer is doing something similar with their topsheets, although it's designed to isolate the vibrations you get from smacking a gate, which can cause delam.
the intellifibers and piezo electric system, quite simply can work. Torsion is applied at a 45 degree helix to the axis of rotation. The fibers, which do have a mechanical response to electric stimulus, are laid in at opposing 45 degree angles across the skis. It does not take much of a complex circuit to turn high frequency electrical input (which is what you would get when the ski is twisted torsionally at high frequencies) into low frequency (or even near-constant) electrical output which would stiffen the ski torsionally against the direction causing vibration, while dampening high frequency torsional inputs. It would, as claimed, have little effect on longitudinal stiffness. I suspect Physicsman is correct about the "factor of 7" though with a slightly more complex circuit you could store energy and return a much higher charge for finite periods of time... don't know why you'd want to though.
Seems pretty silly though went a good piece of sugar maple and a fiber torsion box accomplishes about the same thing, only cheaper and more durable.