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",
It just chaffs my hide when reporters get only half a story right. The other half they either conveniently ignore or are too stupid to notice.