I kinda worded it that way because I didn't wanna spoil things, since it's talking about the end of the game/story. But it was just a general statement.
If you want to be with more than one girl, you can do that. You can pick any combination from two to all of them. If you just want one girl, you can just pick one girl. Everybody seems to have different definitions of harem so I'll just say that if you want to end up with more than one girl, that will be an option.
I can go into more details about what I have planned for ending combinations if you want specifics.
And you don't have to apologize for asking a question. I could write paragraphs talking about these things, so it's no problem.