From the 9/11 video we can conclude that something orangish was falling out of the building, but nothing else. For all we know from that clip it could be flaming carpet, or molten lead carrying flaming carpet, or anything.
Concluding that the falling stuff is evidence of therm*te is two different wrong conclusions, one drawn from the other, with the second wrong conclusion supposedly proving the first that's drawn from the second.
Your second video, f'rinstance, zooms menacingly on the famous angled-cut column image, as if that's some kind of evidence of something, usually therm*te. I've done rather detailed analysis of that specific image using the best resolution I could find and I can clearly identify that it was cut using an undersized torch for the thickness of metal, and that the user changed position several times.