Exactly. It would be impossible for the Y to make the D darker, hence when inverted, the D is going to be a bright white over top of the lighter grey Y.
It’s easy enough to reproduce. Scan a document with text on it, and then draw over top of it with a pencil. Invert it in photoshop and then text will appear over top of the pencil.
There’s also much artifacting happening within this characters.
Overall though, it doesn’t make much sense for this to be photoshopped. A ‘professional’ would have printed out the document and then added back the details by hand - scanned the doc, and then uploaded it.
Which makes all of our pixel searching futile unfortunately - unless we find an incongruous detail with regards to the text.