Found the TrafficLook utility, running it shows the airborne traffic normally as does the aiseparation table. However the IDs shown in the latter are of the type "&HFFFFFF7C" whereas TrafficLook shows the AI flight name as the ID, which is shown in the aiseparation utility under "flight" column. But this shouldn't indicate any problem as it has been like that since before.
The aiseparation utility does not try to fly/control AI in any way, only aims to shift it to desired distance. This is what the aiseparation readme says: "the planes are slewed backwards for a period of time calculated upon the speed of the SLEW and the distance to be moved" (capitals as original in the manual), which hints a simple slew might have been employed.