> Which seems to hint that the subject arrived in the US without proper paperwork.
No, it's just a general statement. Because they can't comment on specific cases.
Also note, he would not have been allowed to board the plane in Norway if he didn't have the papers in order. They check that before going to that part of the international terminal.
That's not true, at least hasn't been true for me when travelling to the US from Germany. They check you passport of course and you need to state that you have a valid visa / ESTA / etc. but the departing airport or airline has no way to check that.
No, it's just a general statement. Because they can't comment on specific cases.
Also note, he would not have been allowed to board the plane in Norway if he didn't have the papers in order. They check that before going to that part of the international terminal.