It seems that you also misunderstood what I wrote, what you say shows that the two girls are in the game and you are right... but if they disappear, others disappear too, unfortunately that's it... It's like you're erasing them from the story... try it if you don't believe me...
You literally said
"Valeria is a "hunting girl" and only has a scene if you are in a relationship with another girl." No, I don't think I misunderstood. Being "
in a relationship" generally suggests a romantic context, not a friendship one.
Valeria's path does not require romancing any other girls.
Also, Layla is kind of one of the main characters. So if MC's friendship is ended with her, then you'll be missing out on a LOT of content, not specifically just Valeria. Alexis, on the other hand, I'd consider an optional character. Up until this chapter you could literally remove her completely from the story and the story goes right on without her. Even Valeria has more required story content than Alexis, especially in episode 8.
That was up until the new beach scene though. With the beach scene, there are variables involving Erynn, Tori, and particularly for Iris... but there isn't anything required to progress Valeria's path.