Noise being apparent or acceptable? What does apparent mean?
What is the standard print size and viewing distance and how does changing that change the result
To me, both the engineering and your definition of PDR are nice theoretical points, but the real key is: compared to the human eye, how much dynamic range can the camera see and record.
The noise issue is separate and distinct in determining the usefulness of the dynamic range, and is influenced by in-camera and post processing noise reduction capabilities, as well as the the viewer's judgement as to what is acceptable.
Is PDR something that you invented as a test methodology?