“What is readily apparent is that the top and bottom horizontal border bars are overlapped by the top and bottom edges of two vertical rectangles.”
I agree. I work in PS and there are a lots of bad areas that could lead one to think it is not a copy of the original but created on a computer.
Not me, but if you go to the original site and read the 3rd comment down, the guy says he was in computer aided design and computer graphics fields and was a graphics designer without a computer. He agrees with the poster's research.