[magicalist]

No they don't. Maybe you were confused by "We may record information about your usage of Google WiFi, such as when and for how long you use the network and the frequency and size of data transfers"?

https://wifi.google.com/privacy_and_security.html

[greglindahl]

I have no idea if the current document was the one I read last decade. At the time, I was alarmed enough to use a VPN.

(edit: archive.org says this page dates way back to 2012. Presumably it used to be elsewhere...)