Quote from pspr:
What part of "the shroud was 'repaired in the Middle Ages' do you not understand? The C-14 dating would be consistent with carbon dating of that material. And, yes as soot from the fire were contaminating the strands burnt for the test, it would alter the testing also.
Furthermore, the infrared study referred to in the OP is a refined methodology and the date range given can be considered to be accurate. The dates fall on either side of the time of Christ and are accurate.
I won't bother giving you any references since you have none that are reliable to support your claims, nor do you present any.