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Hoffman to the rescue: https://www.youtube.com/watch?v=Umb2lhcxHHU
This video basically shows that if you're not thinking about it, "a scoop of coffee" can mean anything...but if you are concentrating, and you scoop the same amount every time (not difficult) you will get repeatable results.
Not all scoops are equal, and I think smaller scoops are easier to get consistent (hence my 7g one scooping 7g). The actual aeropress one is in my opinion too big. The small 7g one also fits in my tupperware for pre ground coffee (I grind my own at home and bring enough in for the next few days - it's fine).
https://www.youtube.com/watch?v=ckcDG1j5jWo