The Earths a globe huh?

I was taught you couldnt see more than 6 miles at sea level, due to the curvature of the Earth….Problem is: this guy has a Nikon P900 and he demonstrates a sea level view range out to oil rigs some 20 miles away and in full view. Globe Earth model is now under SERIOUS question. The implication of this evidence is also astounding from many other aspects.