Since the Free State Project (and also this forum) appears to me (an unaffiliated observer) to be pursuing electoral politics as a route to reclaim liberty, I can see why it might choose to limit association with folks advocating violent resistance. And I think it can make that decision without necessarily rejecting the moral or even practical basis of the alternative they are choosing not to pursue in the context of their organization. Just as Ron Paul chose not to advocate violent revolution while running for office.
Not EVERY message belongs on EVERY stage.