Why should another game be left in a completely different thread? These are two different games, it makes no difference if it is the same dev, these aren't tied together and are different projects. That's why the posted link needs a new thread, best achieved as a request thread where either a link to where the update is mentioned or a download link for the game is provided.
Update frequency is irrelevant, if there is a new game it gets its own thread as long as there isn't a reason why it should be tied to another thread (and it doesn't go against site rules). If someone can't wait for a thread to be updated it's his problem, we depend on people who actually have access to those files and who are nice enough to share them, which sometimes takes time, rarely even not happening at all.
Also, there was already a first demo for the game posted in this thread, but for clarification it should get its own thread (since someone messed up already twice, if not two different people, and uploaded "Shiro no Yakata" instead of "FOBS" here as an update).