No it was a fire, aided by structural mis-design. The National Instute of Standards did an exhaustive report on it that looks very legitimate https://nvlpubs.nist.gov/nistpubs/Legacy/NCSTAR/ncstar1a.pdf
I was fortunate to attend a presentation made by the forensic team on the fire and structural issues that resulted from the attack. This four hour presentation and discussion was made to about 250 professional engineers, contractors, architects and similar technical professionals. Every question, objection, second thought and speculation was brought up and aired out with no one walking away saying anything was brushed aside or not very well investigated.
https://www.independent.com/2009/09/17/elements-great-scientific-and-technical-dispute/
The mist report is far from the last word. There is legitimate opposition to the most assumptions and computer models.
The lack of evidence of thermite in the nist report is an interesting example.
Nist was presented evidence, and nist questioned the chain of custody. When challenged to run the same tests on nist’s own custody proven samples, nist refused.
Interesting, no?