Non-ios Device Accessing iOS.dns.nextdns.io

One of my DirecTV receivers uploaded ~3MB to ios.dns.nextdns.io to TCP Port 80.

1. Why is a non-ios Device Accessing this url?

2. Why is it uploading data at all?

3. Why is it using port 80?

4. When visiting the url, it says it is using https, not http.  Why?