That's how the Trump administration is choosing to interpret the word "facilitate." It remains to be seen whether that was the meaning intended by the Court. Regardless, given Bukele's statements, it doesn't seem that he's been made aware of this, given that he was talking about "smuggling" or "sneaking" Garcia into the US, and how that would be wrong. If the government is providing transportation, there's no smuggling involved.
On a fundamental level though, if the government can simply wash their hands of someone as soon as they get them out of the country, regardless of the legality of doing so, that's a serious civil rights issue. Ultimately, the government's argument for why it can't bring back Garcia has nothing to do with his citizenship or legal status in the US. They're claiming that they can do nothing because he's no longer in their custody. If we accept this excuse, then they could conceivably do this to anyone, as long as they got them out of US airspace before a judge could tell them "no". Citizenship, criminal record - completely irrelevant. As long as the government doesn't actually want the person back, they won't come back. If that doesn't disturb you, I really don't know what to say.