I don’t use PDF file so I’m not sure what to make of this but...
I just opened this PDF file in Inkscape and un-grouped the image.
I can move the text, signature blocks, around too. After I move the text it’s white where the text was. So the security paper has white text imprinted on it.
I’m just going to say one thing about this debunking. I have the same concerns I had with the Polarik(sp?) analysis. Many of the things some are looking at, such as image artifacts, etc are not the best to use and can actually lead you to a false conclusion when you are dealing with an image of an image. In this case, this is supposedly a copy of a document > scanned > uploaded. That is three layers of ‘processing’ through computer programs that can add in these artifacts or other oddities. Those kind of ‘proofs’ only really work on an original, not a copy of a copy of a copy.
If you want to debunk this, focus on factual issues or things like the infamous “Buckhead” discovery regarding fonts that aren’t correct (non existent for the time, etc).
Playing around in Photoshop or Illustrator only reveal oddities that may have been put there though the multiple scanning and copying processes.