Maybe this is splitting hairs but those just seem like classic non-violent protests instead of terrorism. Ecoterrorism is something like spiking trees so that loggers will get blasted with chainsaw shrapnel when they try to cut through a 1000 year old tree. Terrorism is of course a loose term but it generally requires some element of violent coercion. Throwing soup at a painting is obnoxious but children will not have nightmares over it.