That article is all well and good, however the damping factor of the power amplifier is what deals with back EMF - not the cables. If the cables are large enough and have a resistance that is significantly lower than the internal impedance of the power amplifier (fairly easy to do), their contribution is insignifcant.

In any event, active bi-amping makes the cable issue a moot point. Direct connection to the speaker drivers with no intervening passive components presents the power amplifier with a more benign load. Additionally, it is the inductor that exists in all passive crossover networks, and which is in series with the woofer, that is by far the largest contributor to the deterioration of effective damping factor, and which makes the effects of back EMF from the woofer more serious. The elimination of this inductor allows the damping of the amplifier to do it's work.