I don't believe those changes are retroactive... it will only affect the data collection moving forward.
If you have Raw Data Feeds set up, you might be able to find the traffic that way, and use it externally, but I don't know if there is a way to bring that data back into Adobe (possibly with the Data Repair API, but I don't know).
This might be a question for Client Care... just note, this sort of back processing will likely come at a cost....