It was long time ago, his name is Vladimir Stwora. He wrote that number of victims were not identified and 6m is not exact number. BBC is British, but in my country I would report this article to the police.
I consider that overzealous - this article on "it's hard to identify the now-nameless people who were mass-murdered during the Holocaust" is anything except revisionist, yet you would "report this article to the police." What for?