What evidence do we actually have that this was a hack and not maybe an accident or an inside job? It sounds really suspicious that the hack took the form of s

What evidence do we actually have that this was a hack and not maybe an accident or an inside job? It sounds really suspicious that the hack took the form of some sort of remote control which was evident to the actual operator who was present there. At the same time there was an actual operator, who wasn’t even suspicious the first time because apparently remote control was common by the supervisors. I think there’s a good chance we’re gonna find that either the operator, or one of the remote controllers accidentally, or maliciously, made this change, and blamed it on a “hack”.