I originally thought intelligence failure meant a failure to
   anticipate.

   In reality it means a failure to be intelligent.

   Beyond the fact that Tora Bora was meant to be a Deep Underground
   Military Base the CIA built for Al Qaeda
   ( [1]https://en.wikipedia.org/wiki/Tora_Bora#Military_base ), it seems
   more likely that the CIA was defrauded for something that seems
   impossible; the ability to conduct a massive construction project in
   Afghan territory when they were a Soviet client state.

   Or that some woman, who after being alleged that she attended a sex
   party including children, was later found to have been attending a sex
   party including children, to somehow be in continued denial of that
   shows a sort of stupidity beyond my comprehension.

References

   1. https://en.wikipedia.org/wiki/Tora_Bora#Military_base