I don't but this guy does.
No, they don't.
This is shown by the fact that all you can do is link the video rather than even attempting an explanation.
If that person really did have an explanation you would be able to understand it and provide it here.
The video just appeals to the standard BS FE "Law of perspective", which is just a fancy way of saying that FE has no explanation, so we will take reality, which is a round Earth and just pretend that is flat to pretend it produces the same result.
The actual law of perspective is quite simple.
For an object a height h above a theoretical straight line passing level through the observers eye (or whatever observation device is being used), located a distance of d along that theoretical line, the angle of elevation will be given by:
a=atan(h/d).
For the commonly stated 5000 km altitude of Polaris, this correctly gives an angle of elevation of 90 degrees for 90 degrees north, and 45 degrees for 45 degrees north.
But at the equator it gives 26.5 degrees. And even at 90 degrees south this is still positive at 14 degrees.
Perspective does NOT explain why Polaris is not visible below the equator.
You can even try this with a scaled down model.
Go find a hallway with a light.
Note the point on the floor directly below the light.
From an observation on the floor, find the point where it appears at an angle of elevation of 45 degrees.
See what that distance is. Now go double that distance from the light.
If these FE lies were true, the light should now have an angle of elevation of 0 degrees.
But we observe it having a positive angle of elevation.
As we move further away, now corresponding to the region south of the equator, the light is still visible with a positive angle of elevation.
It would take an infinite distance for it to drop to 0.
Here is a simple image comparing reality to what would be expected on a FE:

Directly below Polaris, they align well, being 90 degrees.
At 45 degrees north, they align well, being 45 degrees.
At the equator, there is a massive mismatch.
Reality (and by extension the RE) has it at 0 degrees, but FE demands it is 26.5 degrees.
At 45 degrees south, reality has it below 0 degrees. If you extrapolate it would be -45 degrees. But FE demands it is at 14.0 degrees.
You can also try this with a large sphere, and an object very far away and observe how that does match reality.
So you think it is via the curve that Polaris doesn't show & not through perspective ?
Yes, because that is what actually explains it.
As for proof, again, refer to Polaris.
Observations of Polaris clearly demonstrate the distance is not changing significantly (as the brightness remains roughly the same, and the constellations don't change and so on), meaning the reference point (Earth) changing orientation is what is causing the angle of elevation to change.
Observations of Polaris and other celestial objects show there is a curve.
Once again sunset is due to perspective.
Once again, that is a blatant lie which completely misrepresents how perspective works to pretend Earth is flat.
Is that going to be your answer to everything?
Entirely ignore the argument and just assert Earth is flat?
Try explaining how perspective magically blocks the view.
There's no such thing as outer space, how ever there is such a thing as the firmament/Dome with water above it.
Pure BS.
All the available evidence clearly points to outer space.
This includes the simple evidence of a pressure gradient in all fluids, which when applied to the atmosphere will result in the pressure dropping to virtually nothing after enough altitude.
There is absolutely no evidence of any dome, nor any water above it.
And rockets have been able to launch just fine into space without hitting any dome.