I hear ya but thats debunked by their own numbers just go to the beach and bring a telescope...have a friend start walking.....when the curvature estimates say you should no longer see him but you continue to see him..
Now if you use this method over a lake ...let's say to see a skyline in the distance, weather may interfere ( water vapor / humidity / clarity)
Yet it has been documented that certain skylines by the curvature estimates could not be possible...yet the entire skylines are visible.
