This article uses the words "workers' decision" several times which sounds like individual workers are deciding to not deliver to Tesla. The truth is that a sympathy strike involves a union deciding to take industrial action against an organisation to support another unions industrial action. So these workers are legally striking against Tesla too, it's not just an ad hoc decision made by individuals.
PostNord employees could not just decide to stop sending parcels to a company without it being part of a directed strike.
PostNord employees could not just decide to stop sending parcels to a company without it being part of a directed strike.