Why must the optical obstruction of the sunlight be gasses?
On a Flat Earth, which is accelerating at 9.8 m/s^2 upwards, the atmosphere would surely spill out into the vacuum of space on the edges. And while it is true that some believe in an infinite plane, the atmosphere is finite and therefore the gasses would spread an infinite distance, causing us to have virtually no atmosphere.
Therefore, there must be something that keeps the gasses of our atmosphere from leaving the flat plane of our Earth.
If this effect also were to absorb the Electric or Magnetic energy, any photon passing through could be absorbed. It may even be polarized in a similar way that a lens can be polarized to filter out light entering from a different angle.
Round or flat, you and I can not deny that the sun has less intensity at dawn and dusk than at noon. It even changes color. All because the light is passing through more layers of the atmosphere.
Therefore, stars must also have the same issues as their light should be of similar composition.
We can see this effect by watching your video. The stars at the horizon are fewer than the ones higher up. Even after watching, the density of visible stars increases as you look upwards even though the ones that you see in the upper part of the sky passed over the horizon. In this case, stars without the necessary intensity to be visible are not visible. Those that are, are dimly visible and steadily get brighter as they move across the sky.
It may even be possible that a combination of optical density, polarization, and refraction may be occurring that would explain sunrise, sunset, night, day, etc...
However, I'm too lazy and my physics classes are too far in the past for me to write up the science to prove or disprove FET on this subject.