Not one person in there who did any actual testing.
And molten steel months afterward is a strike against your conspiracy theory, if you ever get around to stating one, that is. Any "thermite" or demolition of any kind would have extinguished long, long before then. Under any scenario whatsoever, the only thing burning months later is the normal office furnishings, and if that's sufficient to melt steel, well then...
As usual, you refute yourself, if you were only clever enough to understand your own posting.