Did you read the linked article through the second paragraph, where they start talking about the evidence? What do you think about FireEye's statement? What do you think about their behavior - also discussed in the article - about posting on Reddit? It seems like you can safely ignore that they are Russian and characterize USAReally's behavior in the same way. When you add in their location and funding background, that just adds to the case.

edit: I added to my comment before you replied in https://news.ycombinator.com/item?id=18355858, I think it addresses your point.