i think a wipe is not needed - its needed when a faction or so is being removed. - but when its added, it starts out at neutral. ( i believe the nomad guard faction was added in 4.84 - and a lot of chars are still neutral to it )
i had chars that killed many nomads before the update and are deep red to nomads of course ( with nomads starting out red anyway ) - but when the guard faction was introduced, they were not killing nomads anymore - hence the guard faction is still neutral. ( it goes down quickly when you kill nomads )
so, no - the pure addition to the world does not require a wipe from what i gather - its really only the removal.