I don’t think I understand.
This is debian testing based distro without testing or even security repos in sources.list.
How is it supposed to work?
Debian snapshot repos are a snapshot of a specific debian repository at a specific time.
This helps providing a stable Base without the risk of breaking things with future updates.
This is especially useful for providing a stable Base if the usual target is moving like testing normally is.
I know what snapshot is. Normally we use it to install older version of packages.
I just want to point out that (unless I enable testing sources) the system won’t be updated, it’s a zombie.
No security updates, no updates for web browsers (apart from default plasma-firefox).