No, 450+ km is the detection range of new PAF aews. We'll outside s400 theoreticall engagement range.First we could push the PAF AWACS further back and with IACCS, S-400's lethality further increases.
FYI,paf aews are now on par with PHALCON AWACS on detection range. We procured phalcon some 15 years back. No follow on AWACS order,thanks to Mr ji.