If poster can't be bothered to offer a summary then I can't be bothered to watch the vid.
The device can add inertia to the suspension travel without adding very much actual mass. If the suspension is thought of in an electrical analogue, we have inertia (inductance), springiness (capacitance) and friction (resistance). The designer will normally have only C and R to employ in his suspension components, and the availability of a compact L allows more complex impedance networks to be used, with possibilities such as increasing isolation of the chassis from wheel deflections.
