He isn't implying Juventus are lying when they say the stadium is sold out. All he is saying is that the foreign travel agencies buy these 3-4000 tickets, and they are not able to re-sell them.
So when Juve announced that the Juve-Novara game was sold out, that was true. At the end of the article, he also says that when these travel agencies figure out that people cant afford these package deals due to the financial crisis, they will stop buying them. Thereby there will come even more tickets to the public to buy.
Nevertheless, the stadium looks absolutely beautiful on TV and it is something we as Juve-fans can be very proud of. The atmosphere is also phenomenal, and has undoubtably given us an advantage!