There is an interesting and apparently, in part, well informed thread here on Pistonheads
https://www.pistonheads.com/gassing/topic.asp?t=1760889
The comments about the actual workings of these Haldex awd systems rather cut across Volvo's claims for stuff branded with the P* monika. Fact is that Polestar had a pretty shabby record of false claims to a long and illustrious heritage under its previous somewhat questionable ownership and patronage that had in fact been writ large by other, earlier and very effective Volvo contractors...... TWR, Prodrive, Flash Engineering, and last but not least the modest but highly regarded Motor Design.
Don.