Looks more complicated than just backwards. Looks like the individual coils are flipped and the order is flipped. Looks like it might be wired to make the 2 / 4 positions hum-canceling, if there's any autosplitting.
What are the factory switch positions supposed to do? Are there any odd individual coil / split combinations going on?
Interesting swtiching. I think it just keeps it hum-cancelling when individual coils from each pickup are being combined.