[yaris]

The amount of communications would be better illustrated by the number of connections made in a period of time, maybe complemented with the amount of data transferred up/down. Making a 1000 connections towards one domain name with different URLs does not fundamentally differ from making 1000 connections each towards a separate domain name (which names can be the same server, just with a bunch of IPs).

[lapcat]

You seem to be assuming that the author set out from the beginning to measure scientifically the amount of communication that occurs. What is much more likely is that the author's DNS provider, NextDNS, provided this information, and the author simply noticed it.

[yencabulator]

That's just the amount. The DNS names "leaking" the service in question is extra information, and interesting.