Since "Antifa" is also a system of tactics, it's also akin to saying something like, "In Northern Ireland today, Terrorism placed a number of explosive devices near a local office." Again, it's nonsensical - Terrorism was a tactic of the IRA, but wasn't an organization or a group of people.

Close, but incorrect.
The Irish learned that putting on uniforms and going toe-to-toe with the British Army was a bad idea. Thus the IRA was born...it had a centralized political wing and then a bunch of 'cells' that operated independently.

Each 'cell' was compartmentalized such that it could function on its own with the added benefit that if the British security services managed to roll one of them up the damage was limited to that one cell only.

But the training and tactics was consistent across each cell of the IRA. That's the model that Antifa follows today.

No one who looks at their tactics and their organization can say, "Hey, what a coincidence it is that all these same people somehow manage to follow the exact same playbook coast to coast" while simultaneously claiming there is zero organization there.

We're going to have to agree to disagree here. They *are* a thing and their cells coordinate targets, methods and tactics.