I could equally ask "Is capitalism terrorism?"

And I would bet that a quite few people from those bubbles would answer yes.

For me, statements like "antifacism and anticapitalism are not terrorism" is propaganda hidden in political slogans, not meaningful definitions. Their intention is to shield acts committed under those labels from being judged by the same standard as politcally less sympathetic violence.

Terrorism does not stop being terrorism because the people claim to fight capitalism, fascism, religion, imperialism or anything else?

Is Christianity terrorism? As a religion obviously not. But still horrific acts were done in the name of Christianity and the Islam. Just ask the witches...

So labeling yourself an anti-fascist or anti-capitalist does not magically makes you a non-terrorist.