I don't imagine he's lost interest, it's just that most of these posts seem to reach a logical conclusion and then no-one says anything else. And then the board is quiet for ages. If he reads this, I'd sure be interested in an update too.
Making a game is hard. The 13th Doll team has been working on a sequel for like 5 years now and they're really nowhere close to being finished. This guy, working alone, may have realized there was going to be a lot more work than he bargained for. If not, then an update would be nice. I'd like to know what sort of progress he's made.