I don't know anything about the law, but surely if there were libellous remarks on the page, (and I'm not saying there are) it would only be necessary to remove those bits. I think I am right in saying to be libel it has to be untrue? Perhaps we should respond by asking him to state which bits of the article are untrue?
As for it being a vanity page, we should deal with that later, after we decide what to do about the libel accusation.
Theresa