I've been working for the past week on a new kbin app. At the moment, it's just a prototype and only the "Feed" view has content (you can't sign into an account or post anything yet); you can see threads, thread images, thread comments, thread links, and thread votes/boosts. You can also change the "Theme Mode" and "Instance Host" in the settings.
Ernest will no doubt correct me if I'm wrong, but I think he's also said he'd prefer to leave aps to those for whome it is a core strength.
I think he knows it's something the community would like, so I think the post you link above was in reaction to Artimis unfortunately going offline and the App (for now) dieing with it (since nobody seems able to contact the developer). I suspect it's something Ernest will progress 'in his free time' if no other apps which live up to his ambitions are developed first!
I think he said even further back that he wanted to eventually come back to it but I also certainly did not wanted to discourage OP from working on his own one, especially an open source one that could get picked up by someone else if needed. I think the more apps we got, the better. And hopefully some of the Lemmy exclusive apps will support kbin too after the full API release.
The Mags tab shows mags but clicking them doesn't do anything
Changing Instance host to "kbin.social" gives me a "something went wrong" when I go back to the Feed tab. Also the magazines now give me the same "something went wrong"
The individual magazine's page has not been implemented yet; I might try to work on that tomorrow. Unfortunately, kbin.social does not support the API yet (that's why karab.in was the default).
You're welcome. I'm part of the Mbin community (in fact the 'M' stands for Melroy). If you need more help or having issues, feel free to contact me when you need!! I'm also on Matrix.