This user-to-user community can't tell you exactly what was going through the Reviewer's mind. We don't have a crystal ball. But it's fair to say that it was rejected for Quality & Technical reasons rather than an IP violation for the typewriter.
My first thought is that the poem could be subject to copyright protection. My other thought is that you made it all about the poem and not the typewriter.
can you shoot it again with all the focus on the keys?
try uploading a few more times, Lve had photos accepted on the 4th try... and yes I don't get it either
There are at least two issues: it's monochrome and such conversions are not allowed; and it's not well composed. More of the typewriter and less of the background.