If this telemetry file they're showing is undocumented and Apple is intentionally hiding this analytics upload from Settings -> Privacy & Security -> Analytics & Improvements -> Analytics Data (which allows you to export the json files it uploads), then I feel like that'd be a much bigger story and would at least be mentioned here.
The function he is talking about is undocumented, encrypted, can’t be turned off and uses different servers.
The whole thing might be illegal too, at least in the EU