Huh? Here is the 2nd paragraph of the linked site. It certainly does refute the post above. I think your reading comprehension needs some work:
"Radiocarbon analysis has dated the parchment on which the text is written to the period between AD 568 and 645 with 95.4% accuracy. The test was carried out in a laboratory at the University of Oxford. The result places the leaves close to the time of the Prophet Muhammad, who is generally thought to have lived between AD 570 and 632."
Note that "AD 568 to 645" is different than the Slashdot article lead which says "545 AD and 568".