Since the bottle says for GM vehicles upto the 2005 model year, I'm pretty sure that implies that it's meant for applications calling for Dexron III-H, Dexron III-H would've been the standard fluid used for the 2004 and 2005 model years before GM started factory filling all of their transmissions with DEX VI, correct?
If you're that concerned whether it's correct, you can always buy AC Delco Type III-H fluid. Although I wouldn't be that concerned, just dump whatever dex-merc in there, if you're actually bothering to maintenance the thing it's probably better with any type of new fluid than old fluid.