There is nothing wrong with the Walkthrough...
If you are having problems then the issue is you probably used the Relationship cheats which throw off the events or missed the conversation you need to trigger an event happening when it is supposed to.
The only issue the WT has involves those who are continuing from a previous version and loading an old save...
When scenes available in old versions, are extended or used as triggers for new scenes, Sometimes you have to repeat a scene you did in a previous version to set the newly created trigger variable that didn't exist in the older version.
This is normal for any game that is a WIP.
As for the relationship points, the rules to finding them all is pretty simple....
If you get points doing something with someone, Repeat that event until you stop getting points.
Do that and there is no reason to ever use a cheat in this game.