The darbar is buggy way beyond that explanation you quoted. And it has not been that way all the time.
Two friendly bombers, flying across the map at 20k+, not causing a darbar at all... is a bug.
Upping for suspected NOE cons flashing strats, and finding 15k bombers at arrival (with suddenly appearing darbar at that moment), is a bug.
Running into 3-4 high alt interceptors without any previous dar in this or any adjacent sector, is a bug.
Watching a base flash with no dar, then seeing lotta cons with sudden darbar when going there (and the cons weren't a NOE raid that just popped) is a bug.
None of that has anything to do with a short delay, clipped map, or not being in arena long enough. All of this is a bug, because it only strated to happen a few years ago with no public statement that a big 'random' factor has now been introduced to the game
All of that above has been happening to me while watching the map continuosly for 15+ minutes, without minimizing AH or similar stuff. Tt happens frequently but irregularly and it happens to a lot of folks for a long time now.