I am not trying to discredit it yet, but from the beginning it smells biased:
Compare the author introduction
Taken from article:
J. Scott Armstrong (Ph.D., MIT, 1968), a Professor at the Wharton School of Management, University of Pennsylvania, is the author of Long-range Forecasting, the creator of forecastingprinciples.com, and editor of Principles of Forecasting (Kluwer 2001),
Taken from Wikipedia:
J. Scott Armstrong (born March 26, 1937), Ph.D., is an author, forecasting and marketing expert,[1][2] [3] and a professor of Marketing at the Wharton School of the University of Pennsylvania.
