> They specifically weren't found liable for on the ground activity, so the fact that only six employees were on the ground seems like a bit of a red herring.

I think that's not what the article is saying, although I read it that way too at first. Greenpeace USA, the organization whose six employees were on the ground, was found liable for "almost all claims"; it's only Greenpeace International and Greenpeace Fund, their sibling organizations, who were found not to be "responsible for the alleged on-the-ground harms committed by protesters".