They will not win or overcome this one.
The only legal way to get registration signs from the Swedish Transport Agency, is through mail by Postnord. Tesla will not get any mail from Postnord from now on because of sympathy strikes, which means that there will be no new Tesla cars in Sweden until they sign.
Sorry, only source is a news paper behind paywall at this moment. I will update when we get more reports:
https://www.di.se/nyheter/drapslag-for-tesla-bilarna-far-inga-nya-registreringsskyltar/