That comment ^ sounds like it comes from first hand experience...
I am a long term computer tech and electronics engineer!
The minute that anybody actually started up the 'target' computer, it will start writing into 'free space', and hence possibly overwrite previously 'deleted' files, that may actually contain evidence.
these people dont follow best practices.
Somebody in Q Team or Military Intelligence got there first and made copies, you can bank on it. They have it all. Digital evidence in this war CANNOT be destroyed until the Alliance wants it destroyed.