Like the shroud of Turin this is just another example of wishful thinking. They found some random tomb that has survived and announced that it was the tomb of this fictional character Christ. No chain of custody for evidence, just the wishful thinking of somebody who wants it to be true, just like the entire resurrection theory. Complete and total hogwash.
If we were to say this is the burial site of Joseph the plumber, the proponents of this idea would have no evidence to argue otherwise.