What is unique about the recent mass stranding of false killer whales in Tasmania?

A pod of 157 false killer whales was stranded on a Tasmanian beach, with approximately 90 still alive as of Wednesday morning. While strandings of false killer whales are reasonably common on Australian beaches, State Wildlife Officer Brendan Clark noted this is the first time in 50 years they have beached in this particular part of Tasmania. This incident is especially notable because mass stranding events in the region typically involve pilot whales rather than this poorly understood deep sea species.