Hello Stu! Sorry but we display the information the Thread network provides. You can't trace it back. The room for Thread Border Router is always set to Unknown Room as Thread does not provide the information. You can check Thread functionality as well with this tool: the app Discovery on iOS (https://apps.apple.com/de/app/discovery-dns-sd-browser/id305441017) or the version for the Mac (https://apps.apple.com/de/app/discovery-dns-sd-browser/id1381004916?mt=12). In the app at _hap._udp. you will find the Thread devices, at _meshcop._udp. your Thread Border Router (HomePod mini and/or Apple TV 4K 2021).
Best regards, Volker
Nov 10, 2021