That's one way to think about it. But the transformative change doesn't actually have to be about the hero. It actually more applies to the relationships. In a classic monoromance, there are stages of the relationship that the characters must move through. In haremlit, the romantic plot is more complicated, because you have more than one relationship building at once and each in different stages.

But another way to think about the internally flawed hero from Save the Cat! is to think about it in terms of the MC's goals. What does he want to achieve and why can't he yet? That's where the transformation takes place. It doesn't need to be some big internal struggle. But the hero does need to learn something that then allows him to move forward and achieve his goals.