Add to that the multiple layers of a supposedly scanned document, the different pixel distributions of some of the layers, fonts that can only overlap if a computer is used (when the certificate was supposedly done with typewriters), etc. etc.)
That certificate is as fake as Obama’s “intellect”.
The big concern over hidden layer information is an artifact of what happens when you use that particular software to look at anything ~ and besides most of the "oh the horror of it" commentary focuses on a RUBBER STAMP MARKING otherwise identified as the birth certificate number.