How does this confirm that?
I recall in the premiere trailer that when Noble 6 gets off the jeep to report to the rest of Noble team Jorge says "I didn't think anyone survived Pegasi sir" Which i believe is a reference to Pegasi Delta In Ghosts of Onyx. The planet where the Spartan III Bravo Company was wiped out destroying a Covenant fleet refit and refueling base. With only two survivors. Tom and Lucy. Now the thing is in the book it says that Lucy was so traumatized by the events at Pegasi that she became unable to speak... could Noble 6 indeed be sweet little Lucy from Bravo Company?
Probably not. The events in Ghosts of Onyx coincide with what the chief was doing and the Halo rings becoming active, Tom and Lucy, the S-III Gamma Company teams, and Kurt were all on Onyx. That being said i guess there is room for conjecture that Noble 6 is/was a member of Grey Team, Grey Team would have needed to be on Pegasi as well to make Jorge's comment valid. But with all the gaps and lack of info we cant be certain.
When in doubt... blame ONI.