Earlier quoted context omitted.
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…
> I'm trying to say they're immune to previous generation stuff S400 works just fine for detecting F-35s.
The S-300 systems in Iran were completely ineffective against IDF F-35s. Doubtful they even got a detection.