JEB
Legend
You really can't deduce anything. Wizards has been pretty clear that only what you see in the current core rulebooks can be counted on as "official". If it's not explicitly stated there, it's a blank slate.Yet it clearly confirms to the original presentation of the Setting in many ways, and the Easyer Eggs on the map are some deep cuts. We can deduce quite a bit from this map, at least in broad strokes.
And isn't that the point? They're not bringing any version of Greyhawk back. They're creating a new version for a new era that DMs can use as a template for building their own setting. If someone wants to delve into other editions' Greyhawk lore to fill in the gaps, they obviously can, but that's an individual choice. I assume Wizards is just as happy (maybe even happier) for someone to completely invent their own explanations for every Easter egg.
In short, there's no deeper meaning to be discerned here about 2024 5e Greyhawk. What you see in the DMG is all we know.