Agreed; part molten girders is what the witnesses said. But that’s evidence for ongoing fires, not a pointless, fantasy-tech demolition.
More plausibly, it is evidence for large pools of molten steel, trapped and insulated by the wreckage. Steel that was heated so high above its melting point that it remained molten for weeks. Smaller pools would have soon solidified.
Huge streams of molten steel cascaded down the outside of building therefore it’s reasonable to speculate that even more was running down the main support columns forming large pools. Girders semi-submerged in the pools were partially molten when uncovered by ground workers.
That’s my scenario. I’m still waiting for yours.