The Professor in charge of the investigation is literally the most liberal human being you could imagine (he founded the schools chapter of "BiLAGA", the precursor to many Gay/Straight Alliance clubs), advised multiple progressive clubs, and was rather antiwar. To say that he was not likely to go along with a George Bush conspiracy is an understatement.
My roommate was one of the grad students who literally worked on the studies you are claiming were faked. We've spent hours talking about exactly why the people who faked it were wrong. You can easily google any of the counter arguments yourself, as there is over a decade and a half of the debunking out there.
As a final note though I want to point out that an Architect is not an Engineer. Look through this course description[1] for a bachelor's degree in architecture. Of the 2,300 people who signed on to the petition you're referring to, only 30 claim to be structural engineers. It turns out many of those were unlicensed, several had never worked on tall buildings, and only a few of them had every even read the NIST report[2]. While I can't find the study of the architects with that kind of data, it seems obvious to me that with the lack of background checking done on the petition for the engineers that a significant portion of the 2270 architects remaining are nowhere near qualified to make the claims that this organization has made.
[1]https://cooper.edu/architecture/curriculum/bachelor
[2]http://lies-of-the-truth-movement.blogspot.com/2010/10/richa...