it's a cute presentation, but flash (pun intended) is no substitute for facts and dispassionate analysis of same.
for one thing, the silly 'can a huge jet punch neat little holes in a steel reinforced building?'. i mean, come on - duh. ever seen the engine on a 757? can you figure out the physics of that engine going from 530mph (this speed is not established, by the way) to zero in a matter of a few dozen yards? you bet it'll punch a neat hole in a steel reinforced building.
here's some counter arguments, with a little less hysteria attached.
http://www.snopes.com/rumors/pentagon.htm