Yes, the new part is that it's extrajudicial. The rendition of foreign citizens can be done without a court, because they aren't covered by the US constitution. Only those "under the power of the united states government" are granted due process by US courts.

The line being cross in taking persons unknown to courts from the united states, to a forieng country, isnt "a new part". It's to suspend the constitution and grant the president the power not merely to arbitarily detain, but to do so in a foreign prison.

It's hard to understate how serious this is. If it were only this, and nothing else, we might hope it will stay bounded by the "hopefully" diligient ICE. But coupled with the assault on all rival systems to presidental power, there's nothign to be hopeful about.

The constitution has been suspend, the president has sequestered the force of the federal government to bring under his private power the whole of american society, begining with the most powerful rivals: the courts, the media, the universities, the law first, and so on.

He will next suspend the broadcasting licence for media outlets.

Optimistically, the supreme court could suspend his emergency powers -- as they ought, since there is no war or emergency. This may make the federal government unable to execute his wishes -- but if they've replaced enough workers there already, it might be too late.