Besides, "they" don't claim anything. "They" cleverly claim that "_it_ believes" it was a state-actor. Who is this _it_ they conveniently hide?
Occam's Razor applies here: the simplest explanation is that they are telling the truth, insofar as they have been able to establish it.
Besides, "they" don't claim anything. "They" cleverly claim that "_it_ believes" it was a state-actor. Who is this _it_ they conveniently hide?