He wasn't removed to a third country. He was removed to his home country, illegally, as he had a court order for deportation but per his own request he left open only deportation to a third country because he was granted his petition to bar deportation to El Salvador after his asylum claim failed.

Had he had been shoved out of a C-130 and parachuted into South Sudan, we'd never even be hearing of the guy because that would have been allowed and been in compliance with the deportation order as well as the order blocking deportation to the one country they deported him to.