Am I right that you didn't read the article?
Its complete title is "Why Affirmations Don't Work And How You Can Replace Them With Directed Questions™ To Get The Results You Want" and Rex Sikes is, as far as I've ever heard, regarded fairly highly by the NLP community. There is a section entitled "Why Questions are More Powerful than Affirmations" which suggests that while you may be getting results with you positive affirmations, you could be doing much better.
Is your belief system really so tenuous that examining an idea may disintegrate it?
From our very own Paul Scheele:
"You can always judge the quality of a training program by the quality of the student's experience. I have been in the training business for 19 years and as you can see for yourself, the comments from IDEA Seminars students are outstanding! I have personally experienced Rex's training and he really delivers on his promises! His training style works in powerful ways! Check out what these people have to say..."
Paul Scheele, developer of PhotoReading™ and Paraliminal™