The thing about a single victim was a clarification because the surprise rules were originally changed to keep me... erm... rogues from getting behind someone and waylaying them a whole bunch of times in a row until they ate it.
You and Luke. Crasis had HOW many Waylays? 4 was a conservative salvo from him.
But yeah, the intent is that you can now launch surprise attacks up until someone manages to engage you, rather than the first attack ending the surprise, including for other nearby targets.