His patreon is paused as far as I know. Still, if nothing serious is going on, a small post about what is going on (or not) should not be the hardest thing to do.If you take money every months, you have the moral duty to post at least once a month to inform patrons imo. But in this case, since he doesn't take money for a while, he's entitled to stop any day. The common decency would be to inform the audience if you definitely stop to develop the game though.