Great find, Manu.

This is quite in accordance to what I guessed would be a reasonable limit for fighter visibility (when seen from the side) that is about 7-10 km. From front one would see it from perhaps 3-4 km. From belly perhaps from 15km. From top view over land my guess is that the visibility will be worse.

Interesting is also that apparently aircraft type plays a big role in visibility ranges and tendencies can get reversed depending on view angle.