It’s several organizations or “cells” modeled after the IRA.

Which is it? Is it several organizations - in which "Antifa" isn't itself an organization but an ideology or shared set of beliefs that is held by different entities? Or is it one organization, like the IRA? Who is the leader of Antifa?

You keep using the IRA as an analogy, but the IRA was an actual organization. It had a structure that was based on cells, but those cells were part of a single organization - not separate autonomous entity that simply shared the goals and tactics of the IRA. They had a leader, they had a formal structure. They had rivals that were pursuing the same goals that were not part of their organization (like the INLA). They actually were a coherent group. But that doesn't mean that Antifa is.

This discussion always hits a nerve with you. Seems we have different perspectives on it.

It doesn't hit a nerve, it's just one of the most glaring instances where even though lament that you can't understand liberals' positions you then adamantly refuse to listen to the explanation. Liberals do not believe Antifa doesn't exist. We believe it is not an organization. That it is not like the IRA, because unlike the IRA there is not an actual organizational structure or leadership or single coherent entity (even one structured on cells) that is distinguishable from other entities that have the same goals and tactics. That it is entirely like "environmentalism" or "veganism," or even the belief structure that was "Irish Nationalism" that spawned not just the IRA but other groups (again, like INLA and the various IRA rivals) that used the same playbook to pursue the same goals as the IRA but were different organizations.

For some reason, you like to insist that the board believes a false thing ("Antifa doesn't exist") rather than what we keep telling you we believe ("Antifa is not an organization"). You might disagree with us over whether Antifa is an organization or not, but it's baffling why you keep refusing to accept that no one on this board claims that Antifa doesn't exist.