Audiofeil, In fairness, Zieman may have been thinking of cable capacitance, which does play a role in loading the cartridge but which is less of an issue with MC cartridges, as opposed to MMs. "Impedance" comes from both resistance and reactance, the latter due to capacitance or inductance, which I am sure you know. So the pure DC resistance of a phono cable does not tell the whole story.
On another note, where are Ortofon cartridges manufactured? I'm used to thinking of them as English, but I may be wrong. Maybe Japan?