Henadic Theologian
Legend
They're talking about the rollback of much bigger controversial changes, such as rearranging/removing large portions of the continent and the world, removing well-known (even beloved) cities/nations/regions, and adding much-derided new cities/nations/regions (although I imagine Tymanther at least will stay in some form). Compared to these, the changes in the PDK are like a mere candle vs the sun.
Tymanther suffered from being linked to the Spellplague for awhile, but I think the SCAG & The Brimstone Angels & Griffin Brotherhood Saga changed that and it really feels like it made a place for itself in FR. It wasn't the only major change to a location that survived the Sundering however. Dambrath stayed a Were creature tribal nation instead of going back to a Half Drow nation for example.