for your information, GPS doesn't require matrix connection (the navigation in your car isn't linked to internet, and yet it works

)
secondary, the original GPS location was given and downloaded, after that you could work offline.
third, if you work through proxy, you can still be traced (I understand you use your node as anonymizer not as a simple router), you have enough skills to set this up. Like you say, in case of proxy, your link would have to be cracked.
Regardless of the fact, the agent is running from your node, based on above I assume Alice's commlink is connected via your commlink as a proxy - I'll be updating the IC to reflect this.