The message, whether informative, promotional, or both, ultimately needs to reach its audience. On both counts, this article failed to reach tbirdz and likely many others.
It wouldn't have been too much trouble to bring those skeptics back to the conversation by adding a short disclaimer closer to the beginning of the article. So why not do it? If the article is going to be both informative and promotional, some will want that expectation to be set right from the beginning. And if the informative bits can stand on their own merit, there's no risk to the promotional side in adding the early disclaimer. (IMO, it's not an unreasonable request, and not without precedent.)
It wouldn't have been too much trouble to bring those skeptics back to the conversation by adding a short disclaimer closer to the beginning of the article. So why not do it? If the article is going to be both informative and promotional, some will want that expectation to be set right from the beginning. And if the informative bits can stand on their own merit, there's no risk to the promotional side in adding the early disclaimer. (IMO, it's not an unreasonable request, and not without precedent.)