The World Trade Center's design moved the supporting columns to the exterior walls, providing more rentable space and also making the towers sway less in the wind. It was not the exterior walls that made the towers sway less in the wind. It was the huge computer-controlled mechanism at the very top of both towers which kept the towers from swaying so much, without which they'd make people sick.
A few months before the atrocity took place, the History channel ran an episode of Modern Marvels which detailed how they built the towers and exactly what it took to keep them from swaying. When they replayed it after 9-11, they cut out that entire part about the anti-sway mechanism. I've not heard anything from anyone concerning this important piece of info.
As the Towers stood and burned after an impact and subsiquent fuel fire beyond the original design limits, I think there are thousands that owe their lives to the design performance. The article's use of the word "fire proofing" doesn't convey that all such protected elements are merely "fire resistive" or "fire rated" for a designed in time such as with a "One Hour Fire Resistive Construction" element. Building elements are Non-Combustable, Fire Rated, Fire Resistive, or protected by fire suppression systems...even concrete is not ultimately "Fire Proof" in a big enough fire fueled with volumns of fuel beyond availible fuel from the building.
The post-mortuems are often reporter driven looking for news worthy "blame",