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Just because SMG is not present in Halo CE doesn't mean it doesn't exist in the universe at that point. It appears in Halo 2 but also in Contac Harvest, 27 years before Halo CE.
So its really simple that Splazer is in ODST but not in Halo 2. There is no mistake. And generally, the more recent product trumps older ones.
And while Halo Wars is not made by Bungie, its fully considered as canon by them (i think there was a quote about that). And real canon is decided by Microsoft, Halo IP is theirs. So Splazers existed even before Halo CE...