I never said it was. But I'm saying that I don't believe that the stated curvature is accurate.
He's the Lake Michigan link. It is a more simple example for you to wrap your heads around.
https://www.youtube.com/watch?v=o37t6iBS_q4
You have posted this link about Lake Michigan several times, I still do not understand what your point is. I can assure you from personal experience that when out on Lake Michigan in a boat that you can see short buildings starting to disappear at less than 10 miles out when shore is still clearly visible. Milwaukee's port is generally much more clear than Chicago's port. If you are trying to prove the curvature of the earth then your video link is very helpful.