This isn't going to be popular, however getting away with something for a period of time is not the same as being approved/sanctioned/etc. In the petition the author claimed that the app "spontaneously began violating" one of the guidelines, when clearly it has violated it all along. Yet that disingenuous angle is used constantly when people get away with something for a while and suddenly aren't.
As an aside, it's interesting that anyone thinks that making a big noise about this will cause Apple to revert their stance (as app using a pill as their icon, naming it after a controlled substance, and using narrative like "the most awesome keep-awake"). That is improbable. It seems much more likely that Apple will be very certain this app is renamed, and the narrative changed.
This is childish, nonsensical argumentation. The app has always been in contravention of the rules of the app store.
What's really nuts is if this was a company like Adobe instead of a small independent developer we wouldn't even be having this discussion.
That's the crux of the issue here, not to what degree this app may or may not be promoting drugs (give me a frigging break).