A winder can (and will) say "I'm aware of how vintage pickups were tensioned, layered / scatterd, shaped, and what kind of wire they used, how the wire was drawn, the insulation types, what the final coil capacitance was, inductance, resonant peak, Q factor, etc." and all that tells me is that they are aware of these factors in an abstract sense. I have no confidence they properly observe all these factors, or reproduced them. Given the random nature of original PAF construction, the truth is that you'd need to know what the general range of these factors would be, since no single value would be representative.
As a practical matter, nobody would destroy a perfectly good PAF in order to learn about it's construction. That would be like burning money. So it's like Schrodinger's cat; you have a working PAF and can know the electrical values of a PAF, but not the physical properties of the wind and wire, or you have a broken PAF, and you can know all about the wire, but nothing about the electrical properties, but you can't know both, unless you destroy a valuable authentic PAF pickup in the process. So I have a reason to be suspicious of anyone who claims to be intimately or extensively familiar with these details, and yet doesn't elaborate on exactly how they gathered this information to begin with. I mean, people have even been known to occasionally lie from time to time.
