A real loitering system could land at a strategic observation point and wait for days.
There’s a few names for that kind of system, and they do exist but these are not them. These are intended to be deployed by a unit that either is setting up for a near-future ambush or are left behind while the unit leaves the area - hence they loiter in an area. Think of them as the modern, flying, directible version of the classic Vietnam ‘Claymore on a tripwire’ setup, only you can have them come rendezvous with you for later use if the enemy doesn’t do what you thought they were going to. I believe that the article’s right about this being the first war in which purpose built weapons systems of this type have been used.