These are AESA radar detection distances of 2 opposing fighters based on the frontal RCS
Here it looks like we have to wait until we get as close as 18km. But IRST is 100+ km and it
can cue our AESA radar to focus beams on that spot. Entire force of AESA radar focused
on 1 tiny spot like laser could give a radar lock. Or even without a radar lock, missile with IR
seeker could be fired close to that area WITHOUT a lock until it finds said target. Periodic
coordinate updates are also possible. Red Flag and 1 billion chats about oh the great F35
never mentions that if you can see it by zooming in with your optics, you also can hit it.