While TAZ focus on Baffin/Omegas, and OSI Sirius wide a trading group, that doesn't mean they ignore the other Zoner stations. Just because they base out of one location doesn't mean they won't go assist their fellow Zoners in time of need.
That line wasn't meant for militant Zoners to pop up. It was made so Zoners could properly defend themselves and their stations without fear of being sanctioned cause "you're a Zoner. You can't do jack against us if you tell us to leave". It makes no sense that Zoners wouldn't have their own laws, and a means to enforce them. That doesn't mean they are now a Military faction. It just gives them the ability to actually enforce their laws without being sanctioned.