For example, assuming that inflated temperatures where used on the Optris, then you can calculate that setting back the emissivity to 1 should have resulted in a temperature of 342 degree C, not the 366.6 degree C which is mentioned in the report.
Also it was shown in post #548 that iterating to the end temperature on the Optris does not result in the shown iteration temperatures presented in the report.
Ah - but you are not remembering the key (well hidden) sentence in the report which says that for the lower temperature emissivity values they corrected the book values based on empirical results from TCs. And we do not know how this was done, or what their inferred values were, hence we cannot tell anything about the method from the dummy temperature values.