This thread is making the same point, well, two points actually:
Qobuz seemed to have made a lot of tracks and complete albums unavailable on their streaming service in the last few days. These seem to be from the smaller specialist labels, e.g. BIS, Chandos.
For some of us (even though we are all on the same stable build of Roon, B610), we are NOT seeing the red “unavailable” text by the tracks in question.