Hello Lec! Both the actual Eve Weather and Eve Room will connect using Thread as you have two Thread Border Router (HomePod mini). To display the HomePod mini when opening Thread network we need a powered Thread enabled Eve accessory like the actual model Eve Energy (EU/US/UK/AU).
You can check Thread functionality as well with this tool: the app Flame on iOS, iPadOS and M1 Macs (https://apps.apple.com/de/app/flame-services-browser/id325206381) US: https://apps.apple.com/us/app/flame-services-browser/id325206381?mt=8.
Open the app and wait a few seconds, then look for the HomePod mini or Apple TV 4K and open it. You should see the value _meshcop._udp. indicating it works as a Thread Border Router. In addition the IP number will be displayed.
Best regards, Volker
Aug 8, 2022