Yeah. However, there is Burj Khalifa and many other tall buildings from which you can do this way better, and which there is much more information about, including videos etc.
Yep, that one's true. Just pointing out the sea level notion is likely nonsense.
Just for fun, it should also be pointed out that the opposite would be expected under FET: if the Sun is like a spotlight, and can't be seen when viewed from the side (hence why it vanishes in the distance), then when you get higher you'll be closer to it, and so have an angle much more aligned with the side.
We'd expect the Sun to vanish faster with altitude, under FET.