Here is a vid that shows the same part of the earth. The observer is 30 miles inland from the shore (with a known height) looking out at the mountain with the windmills in the foreground. The geometry of a flat earth would put the mountain 3 times higher than what actually appears. This is the part of the mountain hidden by the curvature of the earth.
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Why reference another video instead of simply answering my question? This video is not correct as the math fails to take perspective into account. I did the math quick and the tower and mt. snaefell should appear almost exactly the same height on a flat Earth. I'll probably do a full video debunking this one soon since it's too much for the comments section on someone else's post.