If the tape was really found in Pakistan it is highly unlikely that an American college student made it. The fact that the online jihadis knew nothing about it makes me wonder if it came from an inner circle (maybe not ordered by UBL himself, you never know).
The language was almost exactly the same as the tapes broadcast in Arabic, many of the same topics were covered.
The fact that it is in English is creepy, much harder for everyone to ignore.
We better get a longer look at this thing though, small clips don't tell any real story.
I noticed a slight accent. He also pronounced "tyranny" as tie-ranny rather than the more accepted tear-anny.
Retired English teachers notice these things.