Manhandled.
I'm more afraid WOTC does nothing and throws new and inexperienced DMs to the wolves unaided....
..Again
If a new, inexperienced DM decides to run Greyhawk for their first campaign ever, and they have a player who has an obsessive knowledge of the 40 year old setting, and precise requirement for exactly what that DM should have in Greyhawk.... nothing WoTC ever writes could help that DM. IF someone is choosing to use their expertise as a bludgeon, then they are not a good player, let alone for an inexperienced DM.
If your concern is that this green DM is going to start a game, and their inexperienced player is going to say they are a Dragonborn from
points to random place on map but the original Greyhawk never mentioned that Dragonborn lived there and the new example setting didn't say Dragonborn lived there.... I assure, that player and DM will not care. The DM will say "cool" and forget to write down the hometown and the Dragonborn player will forget which one he picked because the paper got lost and they will just make up a new one.
And those are frankly the only two flavors of a scenario I can imagine where any "wolves" would be involved. Either experienced players bludgeoning their DM with "Well, back in Dragon Magazine #3 it said...." or people with no knowledge of the setting, and hence no preconceptions of the setting that need to be explained away.
It would be more effective to, instead of trying to cover every possible change in Greyhawk over the last 40 years, WoTC made a paragraph in the PHB telling old players with expert knowledge in settings to not be wolves and seek to tear apart DMs.