MJ
The screen is part of the airflow profiling of the aircraft shape! Remove the screen and not only would the airflow change over the tail causing handling problems but the very fact that there is no way out for the air would cause massive drag!
Probably best way to look at it is dragging a bucket through water ( a lot of drag ) cut the bottom out of the backet and there would now be minimal drag!
I know I have lost two expensive Boss caps at sea on diving expeditions so they do blow off easily if the wind gets under the rim although I know there are ways of attaching them!
Not saying the film is not genuine and understand the point re sound recording on the Go Pro just surprised as the hole looks fairly large upfront
Pace