Applying your theory, detecting a counterfeit dollar bill is impossible without comparing it to the plates.
Yet bills are routinely tested to determine if they are counterfeit, and the test does not refer to the plates.
If you are going to say that the electronic copy is not the same as the purported scanned original you need the original. That is what they are saying. How can you say that without never seeing the original?
They are pointing to software artifacts created by first scanning and then converting the document to a pdf and saying there was never a scanned original to start with. That is pure BS. That is Jerome Corsi’s book from a year ago recycled as an “investigation”.