Musk' companies regularly engage in anti labour practices [0] to save a couple of dollars per employee and you don't think he would worry about a "few" hundred million dollars? Also, he isn't spending time in court, his lawyers are.
The anti-labor links seem to be all about being anti union. If the union raised the cost of his employees by $2,000/year, Tesla would have been put over a hundred million in 2019, 150 million in 2020, 200 million in 2021. That's even more money, plus it impacts the value of all his Tesla shares, so it may have cost him even more.
And there's no way he doesn't have to get deposed, and otherwise get annoyed.