Based on context on their site, this looks like it was generated in ~2019 from data gathered before that, and some stuff in it is out of date as other comments mention.
They clearly have an agenda, but also openly acknowledge that public surveillance is a two sided coin, balancing public safety and convenience with privacy. Some of the risks they identify are real, but others are unabashedly exaggerated.
> A probe packet contains the MAC address as well as the list of all the past Wi-fi networks that your device has tried to join before, which can reveal a lot about you!
Generally, most modern devices send broadcast/wildcard probes precisely to avoid leaking the PNL. From what I know, directed probes are only sent for hidden APs.
And most modern devices randomize MAC addresses ("Wi-Fi addresses" in Apple-ese, for probably obvious reasons) between networks, and even between broadcasts/connections to the same network.
Correct. All major OSes stopped broadcasting the preferred SSID list by 2017, with Android and Linux being the last. Apple stopped in 2014. Windows by 2009.
Generally, most modern devices send broadcast/wildcard probes precisely to avoid leaking the PNL. From what I know, directed probes are only sent for hidden APs.