That's silly. The fact that you don't know who somebody is says nothing about what some "state-backed actor" knows. If anything, I'm fairly confident that some people in NSA/CIA know who he is for a decade at least, and "probably" have it written in some documents that will long outlive you. Of course, this is as proofless statement as you saying that they "probably failed" to figure it out, but what you are saying basically amounts to "it is so unlikely for this to happen, so it's such a miracle it probably happened!" A more reasonable thing to say would be "it is so unlikely for this to happen, so it probably didn't happen".
That's silly. The fact that you don't know who somebody is says nothing about what some "state-backed actor" knows. If anything, I'm fairly confident that some people in NSA/CIA know who he is for a decade at least, and "probably" have it written in some documents that will long outlive you. Of course, this is as proofless statement as you saying that they "probably failed" to figure it out, but what you are saying basically amounts to "it is so unlikely for this to happen, so it's such a miracle it probably happened!" A more reasonable thing to say would be "it is so unlikely for this to happen, so it probably didn't happen".