The fact checkers must have been away on diversity training

This article on the Islamic Broadcasting Corporation (though 'article' is a bit generous; hatchet job would be closer). Much of it is the standard BBC line on Islam - evasion of reality coupled with attacks on its critics. One line stands out though, defending Mohammed's marriage to this young girl:

I lost count of the references to "child bride". Even till relatively modern times, marriage for women in their early teens was completely natural and common in parts of the world, including Europe.

This is outstandingly mendacious. His bride was not "in her early teens", she was nine years old. This is not some weird fact which had to be dug up - it is freely available information. I knew it, but checked it anyway, an act which took approximately two minutes.

Let's leave to one side the lie itself. We can understand her motives, they are fairly clear. But what are the motives of the BBC in allowing this to pass them by? Does 'impartiality' mean not pointing out blatant lies in articles on their website?