What a load of bullshit. They even use this ridiculous picture what we see before video starts. Picture with pieces of material, which they claim to be nanothermite. Why it is ridiculous? Well, there is few problems with it. First of all, nanothermite is based on nanoparticles, which are small. Word nano comes from the word nano millimeter, which means 0.000 000 001 mm, so the particles in the nanomaterial are quite small. One nano from side to side. When we look at that picture, there is scale in it:
And the scale tells us that the particles in the picture are up to 200-300 µm from side to side. µm means micrometer, which is 0.000 001 mm. Do you understand the difference? Nano is one milliardth, micro is one millionth from the millimeter. What is the difference between million and like you say, billion. Think about it. It is same than show a picture of the elephant to prove that there is mouses in the jungle. Those prefix can be bitches, if you live in country which measures all by inches.
Next problem is simple. According those "specialists", there were used "thousand of tons of nano thermite" despite the fact that there was no technical way to produce a such quantity of nanomaterials. It has been invented later, after the 9/11.
How about the evidence they use, where it come from? Harrit publish his study years after the 9/11, 2007-2009, so where he get those evidence? Not from the ground zero, but from the public, who has taken them years earlier from different stages of ground zero as a souvenir. There is nothing which proves that those souvenirs has been taken right after collapse, so they most likely has been taken during the grubbing up of the ruins. Ground zero hasn't been playground for anonymous public after the 9/11, so those evidence can come anywhere. Whether they are contaminated over the years? God only knows. What comes that study of Harrit, he has been left by himself with it. All scientists which he refers in the study of hes, has wash their hands from that crap.
What about thermite? What you really know about it? When you light it, it reach temperatures up to 3000°C, it forms the superheated liquid which eat its way through the metals. Funny thing is that it is liquid, so it works only in the direction of gravity. It can run on the concrete floor like water, but when it meet metal etc. which it can burn trough, it follows the direction of gravity.
So, what it really was in the picture? Paint. Anti corrosion paint, which normally has similar chemicals in it. Iron oxide, aluminium oxide etc. If you take red anti corrosion paint from 1970 and study it, you find same things than Harrit.