Its an operating system and it does connect to servers for updates, etc.
You can audit how ‘private’ it is yourself since it’s open source.
https://github.com/umbrel/umbrel-os
Personally, I love mine.
Discussion
You are probably right and it is the voice of my lack of programming knowledge.
I would like to know if the connection to these domains is done through Tor, and what is it telling about me?
I don't think it's normal for an OS, which should provide me with more privacy, to connect to domains without my asking it to do so.
#Umbrel