Just wanted to point out that 3 seats should be counted for the F/A-18.
1 for the Finnish F/A-18C, and 2 for the USN F/A-18F.
So, if indeed 3 Rafales were splashed, then there must be an IAF pilot who was KIA on impact or the seat did not work correctly...
If one of the Rafale was downed by the HQ-9 it's a fair bet that the pilot was killed on impact. PL15's warhead weighs 20 to 25kg, whilst HQ-9's warhead weighs 180kg, almost an order of magnitude larger in yield.