AIM-120D’s have range of 86-100 miles; is it possible that this missile was used?
However, if the target turns 180 degrees and puts the F-16/Aim-120 on the tail, the missile may not get there.
Also, the 86 to 100 miles would require the F-16 to be at medium to high altitude.
If the F-16 is at low altitude, the max range would shrink a lot.
Assuming that the A-50 radar is similar to the E-3, then it would have no difficulty painting an F-16 at very low altitude.
If this was an F-16 shoot down then kudos to the pilots.
It might be possible if the A-50 scope operators were concentrating on contested land.