Doesn't that mean that all the MAC address rotation that's been added to WiFi and Bluetooth devices achieved a lot less? It raises the difficulty a bit (you probably need a SDR vs any Bluetooth device) and may have already been known but it should still be mitigated.

If the Apple AirTag things are as affected that could be a huge problem.

Frequency and IQ mismatch aren't likely to be stable across time and temperature enough to put in a database and use the next day, and certainly aren't going to be anywhere near unique enough to track everyone, everywhere.

It's not quite clickbait... it's interesting research.

You should definitely use randomized MAC addresses though.. that helps a lot.

Agreed. I'm not sure why this is so profound of a discovery