HB is possibly hinting to the situation in which the Coalition "sold" us a war for different reasons than they are telling us now (re. Blair's address to the House of Commons, Bush's State of the Union Address, Colin Powell's presentation of evidence before the UN Security Council).

They told us a vastly different story then to what they are telling now. That's the whole controversy. Then it was told to us that Hussein could unleash horrible weapons within minutes where and whenever he wishes, now they tell us he sought to build these weapons but may not have them. There's a discrepancy that undermines their whole case.
And nothing short of a stockpile of WMD's will silence the critics and do away the suspicions.

That's what I think is the crux of his view on the matter.