As I showed with my example of the blinds, you can't just find a straight line in one part of an image and declare the rest of the image is free of distortions.
It wasn't just one part of the image. There were lines all throughout the images posted.
Listen carefully to what I am saying.
You can not use a straight line in one part of an unknown image to determine the distortion in another part.
You measured a few lines, none of which even go the entirety of the image, none of which you proved were perfectly straight in reality, and then tried to claim the image is distortion free. This does not work.
You can not measure spot A and prove spot B has the same distortion, or lack of it. Especially as you have no idea what post-processing may have been done.
Sorry, but none of those images are useful at all as proof. That's just not how lenses work.