Is there a way to recharge the battery though?
TLDR; some vid where a guy talks about jumping a Polestar;
NB I know nothing and am just some random dude on the internet with too much time on my hands, aka may be better to talk to P* support...
From what I can see it's a H6 AGM style battery per the manual
Pure progressive performance | Polestar
SO that means you need a charger or a jump start
Now, assuming you want to trickle charge it back to health, you'll need something that supports AGM chemistry, it should be written in the specs of any charger, link for example not a recommendation
SCA 6V/12V 6 Amp 7 Stage Battery Charger note the "chemisty types" section in the specs. Meaning it will have an AGM mode for charging.
Alternately "Jumpers" should work to boot all the computers etc to get the car operating again, seems that this has been a common problem for Tesla's as well. The main car battery will charge the 12v again (in theory) when a driver is in the seat or "started" but you should be able to see that with your testing rig. If completely flat you may want to charge it for at least a few hours.
It's quite a technical video but here's more on AGM & charging/testing them;
only watch if you like the details.
Example of how to jump using this general overview of "Jump starting an EV".