Yes the court's judgment is so high, 1B USD, that he cannot make money without it being garnished. How does he get back to work? I personally do not think anyone should lose their livelihood over speech, NOTE: I did not say free speech. What he did is reprehensible but not enough that he is basically black balled from making a living. Penalties yes, loss of livelihood no.
"The garnishment amount is limited to 25% of your disposable earnings for that week (what's left after mandatory deductions) or the amount by which your disposable earnings for that week exceed 30 times the federal minimum hourly wage, whichever is less."
https://www.nolo.com/legal-encyclopedia/if-wages-are-garnish...
He was harassing parents of dead children in order to personally enrich himself. Why do you think he shouldn't have to forgo his ill begotten gains? It's only 1B USD, because he refused to stop doing it. And then he decided not to really show up for court and accept the summary judgement of 1B USD.
Most of his penalty has nothing to do with speech. He can keep on speaking all he wants. He might suffer consequences, but he is free to say whatever he wants to.