That's not what the ruling says. I'll link it below so you don't have to trust places like vice.com
What the ruling said was that the union can't use a particular federal act to shield itself against the normal court processes. That's it.
That doesn't mean the union has to ensure the company won't lose any money since the court didn't comment on any such law.
If the union operates in a state where this action is legal, great! Go for it. If that sabotage is illegal, though, it has to face the courts and be held accountable. That's not up to the Supremes, though.
The precedent is merely saying that "the NLRA did not preempt Glacier’s tort claims"
https://www.supremecourt.gov/opinions/22pdf/21-1449_d9eh.pdf