Rosemary Collyer decided that she cannot rule in favor of due process for Americans out of the country to protect them from being killed in a secretly conducted and undeclared war on an amorphous body where the US government can concoct any reasons for killing it wants or simply be wrong and kill innocent Americans. It is amazingly stupid.
This is all acceptable to the judge because she found nothing wrong with justifying all of this with the AUMF. Thus, one can further conclude from this ruling that the executive branch can place the country on a permanent war footing and the judiciary will never believe it is in a position to challenge the deprivation of life or liberty when the government targets and kills citizens.
The White House can conduct an intra-branch process that effectively creates a secret body of law authorizing capital punishment by flying killer robot and, if any members of Congress in an oversight committee give what officials in the executive branch construe as approval, the person will receive a lethal injection of Hellfire missiles raining down upon them from the sky.