Have you read the article in question? I personally saw no indication that the writing was by Paul. The style is completely different and very focused on people as groups, which is the anti-thesis to what Paul has been saying for decades. I also recall that the writing was analyzed by experts (in the 2001 article, I think) and found it to depart considerably from Paul's writing style.
The issue is no-win situation for Paul. He can either offer the real writer as a sacrificial lamb to the press and hope that that is the end of it, or he can keep to his principles and address the situation as he has been. Neither option will guarantee that the issue will be over, unless the writer him/herself comes out admitting to writing the article. But I doubt even that will prevent those keen on smearing Paul from using the article.
And, of course, addressing the article before absolutely necessary, will mean that it will be headline news the next day.
How about HQ coming out and saying 'ron paul did not write this article, it was written by a staffer named X" fixed.