Well, my concern is that I misheard him, because when I went back to research this the highest figure I came up with from him directly was a grand total of a maximum 100 tons of nanothermite for the whole Twin Towers job. This is how false rumors start so please don't quote me on anything more than a Harrit claim of max 100 tons total!
Just for fun, I wonder if anyone knows how many lumens would be emitted from the igniting of 100 tons of nanothermite all at once? That's still 200,000 pounds, or 1000 pounds per story. At, say, 500 pounds of thermite per story being used for the core destruction, how bright would the core be in that aerial picture of the collapse-- you know, the one where the top of the collapsing core is exposed and not shrouded in dust?