I'm not sure what other people will say, but I'd think this is not necessarily a bad sign. If the prof reached out unprompted to update you, I would suspect they saw something in your app and research that they valued and were genuinely disappointed they couldn't convince the rest of the committee. You might just be a better fit in another program. All this to say - sounds like your research is probably valuable, the prof sees it, and hopefully a different program will have more faculty on board.