He's got a legal issue surrounding the game, so until it's resolved yes it's technically abandoned. He's wanting to start on the next one once the issue is resolved from the bits and pieces I've gathered from his many updates
He goes about as in depth as he can on here. Look back to the posts after the current version about a year ago
Edit: went through to find what I could about the start of it, 18/09/2023 is the one where he's upset and venting and it goes from there, there seems to be one missing just prior but I could have just missed the mention