Not so much revert back to as never even was Oracle.
Time did not get rolled back even a day. It was a reboot.Spoiler was Batgirl immediately before Flashpoint. Though I do see that they have kept her previously being disabled in continuity. If I'm not mistaken, time got rolled back to after The Killing Joke, but before Cass became Batgirl? Meaning in current continuity she'd never had a successor.
Which has since been retconned into something complicated.
I wouldn't know. I heard they reveiled Babs had been Oracle after all in the newest version of the DCU.And didn't a new Oracle get introduced recently?