I understand that and as I said, I am not an imaging expert. However, I copied the jpg picture file and then opened in Jasc Paint Shop Pro. I am repeating these same steps as I type this. The file is quite small, 34 KB, and lacking in detail. I open the file and set the view for normal 1:1 viewing. I then crop the image to approximately the area covered by the red circle. I then select the zoom function and place the cursor center in the middle of the red circle. I then select "zoom in by 5". What immediately becomes obvious is a perfectly straight horizontal line running across and including the red circle. A line this straight does not occur in nature. I have no way of knowing the editing that took place but I am convinced that the file has been edited.
You, of course, are welcome to draw your own conclusions by examining the file in a way that is suitable to you.
Try zooming in on a different area of the photo, for instance his face. You'll also see horizontal and vertical lines. They are artifacts of the JPEG compression.