He didn't disappear. Once in a while (a couple times a month) he appeared in Discord with new art or animations.
He wrote quite a lot about the transfer of Powerless to Unity at first, but then he said that the process was very slow and there was a problem with the transfer of animations. They were vector and made using Flash and only for it, and in Unity, if I remember correctly, he didn't find a tool that will read them. He said he would not redraw everything from scratch, as this is not his main activity, and abandoned the whole project, greatly apologizing to everyone.
The most interesting thing is that somewhere in June/July he announced that he would make a micro-project with an elf and a goblin. Basically a couple of scenes with the ability to change the appearance of the participants. But he still deleted the server...
On the other hand, Twitter (X) is still alive and even the last post was September 2. Apparently he didn't see any reason to keep the discord going, considering how infrequent and questionable people were communicating there.