An intelligence agency won't declassify how they determined who it was. That would compromise their ability to use the same method (informant, vulnerability, etc) in the future.
They are standard techniques. It doesn't say they are unique. Just that this hacker relies on these specific standard techniques as opposed to other ones.
They are standard techniques. It doesn't say they are unique. Just that this hacker relies on these specific standard techniques as opposed to other ones.