Note that they analyzed only version 1607. Before Microsoft started publishing Telemetry documentation and before GDPR. Also akadns.net or microsft.com does not appear in a current (1809) diagtrack.dll.
I noted that yeah. It's a shame that it takes so much time and effort to get to the information that Microsoft should just be open about. I think, with the current short release cycle, audits on Windows will always lag behind the real world a year or two. So at best you know how Microsoft was spying on you two years ago.