Don't worry too much about the C14 date report on the Shroud on that page... it will take awhile for the knowlege to be spread that the Shroud date test is invalid and even longer for those who wish it to be medieval to accept the invalidity.
Ray Rogers findings DO NOT invalidate the C14 test... in fact he states the tests were accurate for what they tested - a 16th century patch mixed with 1st century material. The general information about C14 testing is still quite good.
In any case, I just can't pass along a link that contains something I consider mischievously untrue, without comment. Like they say---the lie gets halfway 'round the world before the truth gets its pants on!