The Multi-Domain Operations included EW, IADS, GBADs, cyber etc. So initially, HQ-9 was off, J-10 at a farther range and only Electronic attacks to disrupt the incoming raid. At a precise moment, HQ-9 radar was going to lock the package in IOK. Expecting them to take defensive action, J-10 went in hot without worrying about Meteor at that exact time.
You can see the kill difference between the Punjab and Kashmir packages. Just 1 Rafale in Bhatinda, rest all up North. With Meteor and S-400, it wasn't that simple in the South.