Nope. Do the lines over any of the image. They're straight. They're straight because it is a rectilinear lens.
You are shifting from arguing about the distortion caused by lenses and are arguing about post-processing. This is a different argument than the "lenses can cause distortion" argument you have been peddling. I said "If there are references in the image, you can see if the lens is warped or not." You replied with "No, you can not." If you can't maintain your argument you lose.
It's the same argument: Measuring lines tells you nothing about the scene as you lack the information to determine that.
It doesn't matter if it's because the lens is curved, or post processing, optical illusions or any other reason. You have no way to know, therefore it's not proof.
Again I challenge you, how can you prove the lines are straight because that's how the picture was taken, or because it was post processed to straighten them out?
No you can't. Drawing a few lines in the center of the image doesn't help determine the curve at the edge. It doesn't tell you what part of the image was straight and now bent, and what was bent and now straight.
You keep claiming it was taken with a rectilinear lens. Source? Not that it matters in the least as was proved to you earlier, they also have distortion, which you also seem to have forgotten.
Also, are you ever going to respond to the following? You made a demand, I responded, and you have ignored it multiple times now.
I just see multiple claims here. I haven't seen demonstration of these claims. I look forward to you demonstrating each and every one of your claims beyond dispute.
Claims that anyone with a camera and free software could easily prove for themselves. Have you tried it? What were your results?
If I showed you a photograph that I took, and a matching screenshot of Stellarium that matched the stars displayed, would that suffice for a demonstration beyond dispute?
So, would you? If I provide you with a screenshot and a photo I took that line up, will you accept that Stellarium produces accurate output?
You could also do this yourself, as I said. The only reason you haven't seen any demonstrations is because you don't want to look. I'm not proposing anything extreme here, just that software widely used to predict the positions of stars does what it says.