I mean how could they? There was no crime so no time can be served.
And even if there would be a made up time after which they would get free, these people have been tortured. They won't be easily reintegrated into any society. They will be mentally unstable at best. Which country would take them?
This is a death sentence with torture on top. Without trial, without oversight and as we can see even the Supreme Court can't intervene.
And Trump wants more of them and to add "home grown" threats (US citizens) to the people who land there.
When "agents" without uniforms or identification or warrants, wearing masks, snatch people up and put them in unmarked vans to destinations unknown -- it's "disappearing."
In German, i.e. the language of the work and death camps, Deportation is different from Abschiebung (≈off-pushing). Deportation in German still is associated with the Nazi regime, while Abschiebung is being normalised successfully.
AFAIK, during and after the Second World War, the anglophone world learnt about the German crimes at least partially through a German language lense, so my guess is that the English word deportation was mingled with the meaning of the German word Deportation and the meaning of banning individuals from a place after due process.