I just read the article yesterday in Conde Nast Traveler and this is indeed true. What they fail to mention is that I believe CO was # 8 or 9 on the list behind multilple foreign carriers.
I do not have the mag in front of me so I am not sure on the exact ranking. While I think CO does have the best Biz product of any US airline they definitely do not compare to BA, VS or several other foreign carriers.