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I started the thread because, as I said in the first post, I did not understand the situation that was being reflected in the article;
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Well you should have a better understanding of how airspeed is measured and that all nations did not have the same ability to express that speed.
Your post was a convenient opportunity to demonstrate that fact.
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I still find the remarks in the article a bit of a mystery.
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And they will remain a mystery. There is not enough information to make any concrete conclusions. We can only speculate.
Here are the facts:
1. Instruments require periodic maintenance and calibration. You will not see expected performance despite the fact the dials might show the correct reading if the instruments are off.
2. Not all nations expressed airspeed by the same measurements. There are different methods for determining the effects of compressibility. Some are more accurate than others and some are not very accurate depending on the realm of flight.
3. A pilots ability has a large effect on Vmax.
4. Aircraft require maintenance and will lose performance over time as engines and propellers wear.
5. Aircraft performance is a percentage range over a median. Some will be optimistic and other pessimistic. This is not only due to all the reason's listed above but manufacturing tolerances as well.