Is the Original 9:16 am Suspected Highjacking of Flight 93 a Smoking Gun?

The original NORAD timeline (CNN article in the post below) said that flight 93 was a SUSPECTED highjacking at 9:16 am. This time point for a suspected highjacking of flight 93 at 9:16 am was revised later by NORAD and this point was almost completely ignored by the 9/11 commission. almost completely ignored by the 9/11 commission. (It was addressed briefly towards the end of Chapter 1 of the report and written off without explanation as a mistake).

Clearly, as pointed out below, and as referenced by multiple sources, strange things didn't happen with flight 93 until around 9:30 am.

WHY WAS FLIGHT 93 A SUSPECTED HIGHJACKING MUCH EARLIER THEN?

The only thing I can figure is that NORAD KNEW there were highjackers aboard as part of their highjacking exercise, Vigilant Warrior/Vigilant Guardian.

Could this be a smoking gun for 9/11 being an INSIDE JOB?