And if you think: "Why would they want to do that?", consider that even something stupid like someone misinterpreting a gesture or working for a competitor of a company the regime currently favours can get you there.
They don't need to, because the US has a finely honed system of railroading.
They push captured migrants through the system to deportation via a "rocket docket" and our rubber stamp justice system.
The system being discussed simply allows them to lay their hands on more migrants to feed that existing quick deportation pipeline.
It's worse than disappearing people. Disappearing people implies they need to hide what they're doing from an objectionable public. Clearly, the people currently in power are blessed with a constituency they don't need to hide from.
It's also really unhelpful to act like deportation under any* circumstances is WORSE than enforced disappearance, which generally involves murder and anonymous disposal of remains. I don't like how we're treating migrants and I believe that immigration is one of our greatest advantages over countries that reject it. I can still maintain enough objectivity to tell the difference between disgustingly harsh "push vs pull" tactics and organized mass murder.