Soundly’s pictures and videos of Lake Pontchartrain power lines and causeway stirred up the flat-Earthers’ nests. They clearly show the curvature of the Earth, where it is usually hard to discern. For the rest of us, those pictures are just the consequence of the fact that the Earth is a globe.
Flat-Earthers can’t take this, and they invented various excuses to attack the credibility of these pictures and videos. Some of them look for specific vantage point where it is impossible or very hard to discern the curvature. They would conclude if the curve is not seen from these vantage points, then it should not be visible from Soundly’s viewpoints.
Soundly usually took the pictures and videos from close to an end of the power lines or causeway. He used high-zooming cameras and aimed at the other side of the power lines or causeway. This way, if there’s a curvature, then it would be easy to recognize. Everyone —flat-Earthers included— would do the same thing, for example, to determine whether a table is flat. We would put our eyes near the same plane as the surface of the desk. This ‘perspective compression’ is an intuitive method to find out if a curvature exists.
With the flat-Earth crowd, we have a different situation. They require the curvature —no matter how small— is visible from various angles. To go back to the table analogy, they practically require that the curvature is visible when seen from the top of the table, “or the curvature does not exist!”
Just because they deliberately pick a vantage point where it is impossible to determine whether a curvature exists, it does not mean the curvature is not there.