This seems not to be the case.
@Rugby, as a moderator maybe you can help in getting a statement from the Roon team on the level of support on the Roon API. Then extension developers at least have clarity on what to expect.
All extensions rely on the Roon API and it seems that the changes that the Roon team made regarding playlists have broken the playlist access over the Roon API.
This means that there are complaints for Alarm Clock for which playlists have worked for years but also for newly created extensions like rooMax. What has to be looked at is the Roon Server side of the Roon API, nothing an extension developer can do here.