Board Thread:Questions and Answers/@comment-33935463-20180426192324/@comment-38952966-20200603050649

Technically, GER's ability should be able to reset any action, even the action of DIO's overwriting.

If GER can revert actions that occur during time that doesn't exist anymore, I'd bet it could also reset a retroactive change to the universe like Ascended DIO removing people's Stands.