This video interested me because of the oft seen argument here of looking around us - the earth looks flat, etc, etc.
It is an ideal location to demonstrate it - the island (Ailsa Craig) is ten miles off the mainland, and it is quite clear that the building is visible from just a little higher than the shoreline (I don't know how high exactly, but it doesn't take him long to descend) and it is not visible from the shore. On that premise of looking at what we can see around us, surely that can only demonstrate that the earth is curved?
I was curious to see a FE'ers view - I haven't quite got to grips with this Ferrari effect, so will read into it closer, although ten miles seems rather a tiny distance for such an effect as this. I am surprised that that has been the only FE explanation.