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1. Let's stop re-explaining how radar works as an argument, everyone gets it. For those who don't - radar works like turning on a flashlight, end of story.

2. Non-SEAD RWR is generally limited to "There is light shining on me." Not where it's coming from, let alone providing targeting information.

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All modern (1980s and later) RWRs can determine the bearing of emissions. Heck, even the RWR in the Mig-21 (1950s plane) could determine bearing. With bearings known, all you need is two planes to determine location by taking the intersection of the two bearings. Most RWRs can also identify the type of radar, as well as whether it is searching or locked into a target. Planes can also equip targeting pods that have even more advanced passive sensors: https://en.m.wikipedia.org/wiki/AN/ASQ-213

Passive sensors have advanced significantly.

The sensor you linked is limited to SEAD missions in most occasions.

I am going to admit to moving the bar - but at this point you have MIG-31s in the air looking for SEAD and taking down any AWACS.

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