This is almost certainly much less interesting than it sounds. It's effectively saying that if you're in the US, your network path is probably from one part of the US to another for many of your communications. (eg: Utah to Palo Alto, New York to Virginia, etc) These communications would not be surveilled.

But, if you send 100% of your communications through a consumer VPN and therefore much of your network traffic originates outside the US, your traffic might end up getting automatically collected.