Basically. It also adds the walkthrough to the new chapter and fixes it for the added path, so it can be followed throughout the full game in addition to fixing some other issues.
But I'm glad you like the Laura paths, they aren't meant to be "bad" endings necessarily, but more of just her individual endings. Each girl will get their own in the future so there will be the option to choose who the player wants to end up with if not interested in the harem route.