I don’t necessarily go along with this verdict but a court ruled and I’ve heard at least Joseph Lieberman mention this.
I wish I could find it and I read it in the last week; it was an Iranian-American who wrote an article saying Iran was not our enemy. It was persuasively written at that. I admire General Jim Mattis greatly but apparently, he has harbored some feelings, maybe grudges, on Iran for over 30 years, something to watch.
From your link:
>>”Members of the 9/11 Commission staff testified that Iran aided the hijackers by concealing their travel through Iran to access al Qaeda training camps in Afghanistan. Iranian border inspectors refrained from stamping the passports of 8 to 10 of the 9/11 hijackers because evidence of travel through Iran would have prevented the hijackers from obtaining visas at U.S. embassies abroad or gaining entry into the United States.”<<
Maybe true for not stamping passports. But hijackers of 9/11 held Saudi, Yemeni, Egyptian, and other passports, all very legal, issued by Saudi, Egyptian, etc. governments. None of the hijackers were Iranians or Iranian nationals.
Iran, to date, provides separate papers for Iranian-Jews, for example, when they want to visit Israel, because their Iranian passport shouldn’t be stamped if they want to visit their family in Israel - it’d prevent them from entering an Arab country if they chose to visit one, at a later date even as a tourist.
No doubt, many in the higher echelons of Iranian regime who are in charge are born in Iraq or outside Iran mostly in Arab countries.
Though, it can be almost guaranteed that if the Iranian officials knew about an AQ member passing through their border, the Saudis et al equally knew & much more intimately, about their own citizens.