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He beat me to it!Dex 6 is speced after rack replacement, due to the seals not being compatible with the original fluid. Either dex 6 or the original will work fine as long as you know the rack hasn't been replaced with a rack containing the new composition seals.
Many on the Traverse forum didn't know or never got it done on their early 1st gens. If you are running the original rack you must use the original power steering fluid. If that rack fails the only racks available will use DexVI so the switch should be made at that time.
My Traverse at 100k had some really dirty PS fluid, it took me 5 suck and fills before the fluid was a color I liked.