In the absence of consensus my opinion prevails (because I said so), and I say the thing OP referenced doesn't count as terrorism. Anyone who disagrees with me is, to put it simply, wrong.

(Occupying a forest sure as Hell doesn't count either, by the way -- and that's one I can speak about with particular authority, being a resident of a nearby neighborhood and personal acquaintances with some of the people involved. Frankly, the Atlanta Police Department and Georgia State Patrol are the terrorists here: their actions have not been legitimate enforcing of laws, but rather the acts of a gang trying to claim turf to build their jackbooted-thuggery theme park.)