Well no, that was me paraphrasing from something I saw 8 years ago or so. These types of things are always communicated subtly in letters between institutions especially when one is a lawyer, but even so, one can read between the lines. That said, I actually found the letter and the language is shockingly blunt. Dated May 28, 2010:
https://www.documentcloud.org/documents/4906656-2018-09-19-16-20.html#document/p1
Keep in mind the history here. Nordenberg (and Pitt) had become the defacto leader of the Big East football playing members from 2003 on. Nordenberg was the one that tipped the conference off to the ACC raid, and with his legal background he was heavily involved with the lawsuit filed in Connecticut to try hold it off, and he then led the charge to keep the conference together and viable in retaining its BCS bid, had spearheaded expansion with UL, Cincy, USF to replace the defectors, keep the basketball and football side from splitting which almost happened immediately thereafter, and later, spearheading communications on expansion with TCU and was pushing for UCF.
That letter, even with the language it used, signaled a dramatic shift for Pitt, which until then had worked tirelessly to try to keep the Big East viable. It was clear Pitt realized other football members could not be counted on to commit to the conference. Fairly unusual to so clearly inform everyone,
in writing, that a school most responsible for holding it together the last six years would no longer be committed to staying either. You don't have to be brilliant to read between those lines to see that it essentially stated "we're out and we just need an invite somewhere." The Big East's fate was sealed. Of course it also reaffirmed Pitt would do what it could for the Big East while it was still a member, and it did, because there was no guarantee an invite would ever come.
Publicly, around this time there was also a subtle change in the public statements coming out of Pitt in regards to conference commitment. Subtle changes, but telling for anyone paying close attention and it was a giveaway something had changed or was about to.
May 2010 was also was right around the time the Big Ten it announced that it was exploring expansion. That is an unbelievable coincidence, is it not?
From what I remember, major rumors swirled of the Big Ten talking to Pitt emerged in December 2010 and January 2011. Then nothing, until June 2011, when Nebraska was formally invited to the Big 10. Then all heck broke lose on the B12. Years later it was confirmed a former Big Ten AD during a speaking engagement they had evaluated Pitt.
Pete Thamel reported in August 2011 that Pitt was involved in discussion with the B12.
The ACC invite came in September 2011.