I said it being old and not updated meaned it its too out of date to teach the modern interpretation of the game.The fact that it is old, not updated in a long time and was intended as an example of how-to world build strikes me as making it an ideal setting to demonstrate world building to new DMs.
Unless the Modernize Greyhawk. Which is a Dice roll of WOTC does. They didn't put effort in the 2014 DMG. They admitted it was rushed.
I am entirely justified to not give them the benefit of the doubt until they state they are putting work into crafting Greyhawk as an educational setting