The OP was also talking about deducing presence based on connections and traffic patterns, which using your own WiFi AP isn't going to mitigate.

I don't think there's any reliable way around that. They can do that with real-time power meter monitoring even if you don't have an internet connection.

Good luck to them for those of us who have set up a tailscale exit node in our network and use it whenever they are 'roaming'.

They can see the WireGuard traffic coming in and correlate it with traffic out. WG traffic is easily identifiable.

I have tons coming in all the time some of it goes out some of it does not.