More than likely, “IF” Pakistan really was involve in aiding the US , they didn’t want to appear to be in collusion, as that would fire up the Taliban and local Al Qaeda sympathizers, which would not bode well to Pakistan’s government at the time. Of course, that wouldn’t be a very fun ‘expose’ now would it?
Of note is that Pakistani doctor that helped track Bin Laden down through his DNA, using the inoculation ruse, has been sentenced to 33 years in prison for aiding a foreign ( the US) government. It would seem that if the Pakistanis were involved, they wouldn’t have pursued the doctor so effectively. But as i say, a good expose depends on a good conspiracy theory. It’s doubtful this author really researched the matter or has any real inside info.