Actually I think you misunderstand what he is arguing. Bin Laden's goal is to create chaos at home (Saudi Arabia in particular but in the middle east generally), fear in the west and reprisals by the Americans (to keep the cycle going). The attack on Iraq was exactly the sort of thing that Bin Laden was looking for.
Personally I'm glad that Bin Laden doesn't seem to understand American/western society that well or he would - after getting our attention on 9/11 - have begun to target truly soft targets like WalMarts and McDonalds restaurants. While the Pentagon and the WTC, in particular, made for a sick photo-op and were well known symbols of American power they are also rather distant places, even to most Americans.
One of the interesting developments following the initial shock of 9/11 was the very quick and obvious difference in attitudes towards terrorism threats WITHIN the United States. Americans were shocked and horrified by what they saw but, like Pearl Harbour, NYC is a long ways from Kansas or Chicago California or even Philadelphia. Its not that Americans were not outraged at the attacks but this was not something that was "brought home" to most Americans in the same way that it was to those on the east coast.
I really hope that Bush and his posse can do this right and turn Iraq into a Middle-Eastern France or Germany repleat with a distinctly un-American foreign policy and economic agenda (for the new government to have any credibility at home or in the region it will need to be overtly cool to its liberators for some time, every sweetheart deal will look like they are American poodles) but I'm not convinced that Rumsfeld, Cheney and the lot can do this or even if they want to do this.
If the "new" Iraq descends into an extended period of anarchy or if the new regime flounders then Bin Ladden, and those like him, will find a wonderful new base of operations and recruitment centre.