I wouldn't put any faith in an article. Anyone can write one and make it appear legitimate. Why would that article have any more credibility than posts written on this forum by people who can Photoread?
Not specifically related to Photoreading but to these skills in general, I've seen some really bad "studies" done by people with no training in NLP or hypnosis, and who were trying to prove the skills to be wrong ( and therefore showing it in their unconscious communication) fail in using the skills. There were people who did not establish rapport, use the proper tonality, calibrate, modify their approach to what they were calibrating, and simply used a pattern word for word and were able to get the technique to fail. Of course anyone can make any of these techniques fail. Some even appeared as articles in magazines.
The important question is can YOU Photoread. The book should be enough to learn from and it is not that expensive. The Photoreading step itself does not take very long.