I think it's more complicated than that - it was certainly owned entirely by Volvo as recently as 2015 and seems to share basically all engineering resources with Volvo. Seems like a funny attempt somewhere to make it seem like something other than Volvo - not sure why as Volvo has a reputation that's fairly decent already, if a bit dull and parental. I guess that's why Polestar is separate - to be more fashionable. Polestar still 'engineer' Volvos - I think it was at some point like BMW's 'M' thing - like a badge?