I agree with you that is how it should work but I’m just explaining how it did work from my experience with Qobuz.
Roon is dependent on Qobuz for the albums and when they are removed on the service side (I.e. Qobuz) they are removed from Roon.
It’s a bug for sure, there was a widespread instance of this before and Roon went after Qobuz so that the albums returned to everyone’s library but now when it happens to individuals, Qobuz aren’t fixing it.
They advised me to just add a new copy and that the old copy is doomed, it will not return to Roon.
Here is the original issue that effected a lot of subscribers: