That's absolute nonsense. I happen to have come into possession of a confidential email sent by a highly placed employee at Skilling, Helle, Christiansen, Robertson to Minoru Yamasaki on June 31, 1968 stating:
We have calculated the safety factor of Tower One at 9.2 milicochranes per foot pound. However, the safety factor of Tower Two is only 2.6 and one should at all costs avoid flying an as-yet uninvented jetliner into it at full speed or, actually, even kicking it particularly hard.
So you, PVT, and Architect and Agent Roberts can consider yourselves DEBUNKED!