Those are not scratches. There is black gaffer tape around the rear LCD. It looks like that is not a fixed LCD, different from the D5 and D6. Please keep in mind that is apparently a prototype Z9. I would imagine it is quite close to the final design by now, if Nikon is indeed going to release it within 2021, but the final product may still be somewhat different. And given Covid 19, the schedule can easily change.