The official walkthrough linked in the OP is up to date though. Maybe check that out, because the dev makes it himself like for the first game. It follows the (canon) full harem route and even includes some extra hints for exploration or trying things out etc.
Edit: I see, I see. You are using the in-depth one, aren't you? Because yes that one is not yet up to date but I am not sure what extra benefit it even has. The official one is quite detailed enough and considers all relevant choices for the aforementioned route.