You can't have your death reverted to zero if are alive, you don't have a death in your pocket, you have a death when you are killed.
GER works by affecting existent events and changing them, if the event doesn't exist (i.e. someone not being dead), he doesn't do shit, all of that is based on assumption, the stand stats make it clear that they need a death to begin with.
Ger doesn't need to kill someone, they just need them to have died somehow, nowhere there dos it say "he touches you and you are in a death loop".
Msot people in jojo being struck by GER would die instantly, so it can easily mean "those killed will dissapear", they use the same word "struck" in the stand stats when talking about their deaths.
Even if the databook mean't othereise, the manga is the primary source and it makes it clear that the enemy must die somehow.