I'm not trying to say that f35s are immune to modern chinese technology, I'm trying to say they're immune to previous generation stuff. They don't need to be literally invisible, you can know where they are all you want if you can't actually hit them with a missile.

There's a lot of things that complicate actual fights, people get lucky, people get unlucky, you do clever things like predict incoming sortie directions and saturate that area, but while the f35 is not produced in the same numbers as say, the p51, it's not "the last starfighter" either, the opponent has to get lucky a whole bunch of times before their ability to resist has been removed.