Perhaps McCoskey's original reports of Iverson's behavior at the casino were just plain false. Another possibility is that the reports were accurate, or substantially accurate, and that the casinos reversed their ban (and denied any knowledge of the alleged behavior) after Iverson's lawyers threatened legal action against them.
http://news.yahoo.com/spt--allen-iverson-has-no-answer-for-financial-woes.html Over 150 million in salary, plus endorsement monies appear to be gone.