I'm doubting this is actually surveillance video for the 9/11 attacks. There are many people that despise America for one reason or another, and could of easily filmed this and said what was quoted in the article.
The biggest clue for me was the quote "in which the tape's owner turns to the camera and says in Arabic, "I will knock them all down,". The terrorists themselves never thought they were going to actually knock down the towers, only heavily damage them. Osama Bin Laden himself admitted in the tape of him viewing the disaster.
The Article on CNN