Their facts are not wrong, they are just misapplied and someone with a more general understanding of physics knows that.

One of the facts quoted is that jet fuel doesn't burn hot enough to melt steel. By itself, that is true. But the temperature at which jet fuel burns varies depending on all sorts of conditions, and the standard lab setup is not at all what the towers were. For example, fuel in a jet engine certainly burns hot enough to melt steel, it's the limiting factor in jet engine design.