First of all, that idiot is *not* the architect of the WTC. A japanese guy (died 1986) was, and he had 2 assistants, neither of whom was named "Swirski".
How can "one of the architects" of perhaps the most famous modern buildings in the world be off as to their occupation capacity by a factor of 10?
I agree that he could be a swindler. It's difficult to get any accurate information in times of panic. However, the assertion about the self-sealing floors agrees with the interviews I saw in which evacuees said the fire doors were locked.