Did you get to the part where Barbara described the tonnage of steel micro-balls which can be a by-product of burning thermite?
edit: I wanted to watch the OP video but Christmas got in the way. I don’t believe there is any point in my contributing more to this thread. I watched the horrific scenes in September 2001, it was shown live on UK TV. There have been a number of documentaries examining the weakening and collapsing process, and I accept that particularly since it would only take one floor to break its mountings and the rest stood no chance.
So I recommend we wait for the outcome of any further investigation, and meantime remember the poor souls and families thereof who perished that day.