It's not a lie, it's rather that you misunderstood.
At the end of ep8, (if you chose the right answers throughout the game to show Josy that you were only interested in her) when the MC chooses between the girls he is dating, he thinks of Josy, tells himself that he has feelings for her, but notices that she is already in a relationship with Maya, so he can't choose her. (I haven't tested if it was the same for Maya, but I think so)
If the Josy-Maya couple breaks up, and you chose the right answers throughout the game, we assume that this may allow a solo route with one of the two. But nothing is certain.
I think hoping for a solo route with one of the two by deliberately failing the trouple is a very bad idea. Already, I don't think it would take a max score, or a perfect balance for the trouple to succeed (or it would mean playing with the WT and taking notes at each episode). On the other hand, deliberately sabotaging the trouple is the best way to end up alone.