What you seem to miss is that this is not a labor dispute, it's a political dispute, Tesla has absolutely no conflict with its own employees. The employees of other companies - some, essential service providers for Swedish state - selectively target Tesla for what they perceive as a political threat to their interests.
Where will these political demands stop? Will the unions drive into a bankruptcy any company that expands in another low cost, not unionized country? Any company that employs migrants? Who would bet a billion dollar investment on the answer to such questions?