In March 2023, PCL and Woodside entered into an option agreement...

In March 2023, PCL and Woodside entered into an option agreement for a 3D
seismic program over Petroleum Exploration Licence (PEL) 87 in the Orange
Basin, offshore Namibia. The option agreement provides Woodside an
exclusive right to acquire a 56% Participating Interest in PEL 87, in
consideration for Woodside paying for a 3D seismic survey covering an area of at least 5,000 square
kilometres within PEL 87 at an estimated cost of US$ 35 million and also paying Pancontinental US$1.5
million. Woodside exceeded expectations and carried out a survey covering 6,593 km2 of which 5,952
km2 is in the PEL 87 block. The survey was completed in May 2023.

This tells us that WDS 3D seismiced 641sq kns North and East of the SSF designated area.
I believe that this was on the recommendation of their Geo staff because they saw something in the 2D seismic in the data room which needed to be investigated.
Maybe the pinch out was not as pronounced as first thought or the trough was potentially longer or wider than the first interpretation.
They took a long time to sign up from when they had first access to the data room .... maybe they reprocessed the 2D data and got bigger result.
We will know in the fullness of time but it makes for great postulating.