www.usa.gov/deportation-process 1st question, text was the same on archive. orgbunder biden and there's link to congress site
Discussion
And if you click the link at the bottom of that question ( https://www.congress.gov/crs-product/IF11357 ), it specifically says someone with his status is exempt from that. He had applied for asylum, and if I'm understanding articles correctly, he received it because an immigration judge expressly barred him from being sent to El Salvador in 2019. So still sounds like he was entitled to much more than he reveiced, AND ICE completely ignored an order from a judge to do what they did to him.
So they still fucked up by deporting him like that.