To be clear - this guy's article didn't lead to the Iraq war. He was writing about the information that the US intelligence offices were putting out, which at this point we know was dubious. That really has nothing to do with his credibility.
>>CapmCr+(OP)
Saying it "has nothing to do with his credibility" sounds extremely naive.
It is totally within possibility that he is "writing about the information that the US intelligence offices were putting out" this time too, to make certain narrative that the US government wants.