You may be a retired engineer, but I am a retired lawyer with a late in life career shift to professional political research. I know BS and BS artists all too well. For many years, my living depended on detecting lies and ferreting out and proving the truth.
Lack of clarity is a sign that someone is running a con or is a fool. On provocative and troubling subjects, both abound.
When reinforced concrete fails under overwhelming stress, it breaks up into dust, concrete fragments, and twisted rebar. Aside from the size of the WTC and the horror of the 9/11 attack, no one has shown me anything in the failure of the WTC that contradicts physics, engineering, and common sense.