The immigration judge literally said there was no proof he was MS-13.
Plaintiff Abrego Garcia is not a member of or has no affiliation with Tren de Aragua, MS-13, or any other criminal or street gang. Although he has been accused of general “gang affiliation,” the U.S. government has never produced an iota of evidence to support this unfounded accusation.
https://storage.courtlistener.com/recap/gov.uscourts.mdd.578815/gov.uscourts.mdd.578815.1.0_1.pdf
Trump's attempts at "proving" he was MS-13 was a laughably bad photoshop of "ms13" across his knuckles that took exactly 5 seconds of searching to disprove.