Each bar is wrapped in cellophane, which are then wrapped in the normal outer packaging. To make the 4 pack, they simply took 2x two packs and put them on a cardboard tray,and then wrapped those.
I don’t think I’ve ever gone through so much unwrapping for candy.
That’s only half of the issue. In fact, palm oil is entirely very space efficient compared to rape seed or other vegetable oils.
The actual issue only starts when you take into account that oil palms really only grow in south east Asia and Oceania, and the space required is obtained by cutting down rainforest.