The building is mostly air, ong.
Not the part that is supporting it. There's steel support structures, and masonry.

After that hour, they were not as strong as they were the day before.
There is no reason a kerosene fire should cause a massive steel beam to lose structural integrity, especially as catastrophic as this.

Now you're bringing up the thoroughly debunked sentence "jet fuel can't melt steel beams."
Just c'mon. I've explained this to you before.
Heat weakens metals. It loses structural integrity before it melts. The steel doesn't have to become liquid to be unable to hold up the weight it could when it was "cold."
As if jet fuel was the only thing burning in there.
This is hand waving, sorry to be blunt. Weakened metal that is not molten is still solid. Molten steel is still more resistant than air. And the only other things on fire would be office equipment. If an office fire can cause a collapse of this nature, that's even more of a terrible design. Nobody expects a plane to fly into a building. But a designer absolutely has to consider what happens if there is an office fire.

A healthcare worker's vlog is not a repeatable experiment. This isn't science. I can claim to be a healthcare worker on a vlog.

I know I have this opportunity to watch vlogs. If I felt strongly about this I would take that time to do it. But it would be inconclusive.

Are you trying to disprove your hypothesis?
Regarding covid, no. Regarding 9/11, to the extent I think I can do, yes. Talking about it 20 years ago was me doing exactly that. I wasn't trying to convince people I'm right. I was trying to understand why I was wrong. But I never has the satisfaction of being proven wrong. And believe me, I wanted to be proven wrong. This is 20 years ago when I really didn't want to believe what I was thinking.

Show me someone doing an experiment with a scale model that proves me wrong. Please.