Why would Donovan bother to tell August about one of many girls who auditioned for him, and why would August tell Chuck about it? Neither Donovan nor August would be aware Victoria is someone related to some boy who happens to be a friend of Chuck's 13-or-so years old nephew?
Even if Donovan told August and August informed Chuck, this doesn't mean "the club was behind it" but merely that Chuck was aware of this development.
Well, we know Chuck has
some kind of unpleasant relationship with Victoria because she reacts extremely negatively when Grace says she knows "everything." That's more than just Chuck being vaguely aware of Victoria's porn career.
But I agree that whatever is going on, I don't think it was "Club" business. If that were the case, I don't see how Victoria could have let the MC work for Chuck without going through a similar crisis of confidence. She clearly had some misgivings about it at the start of the game, but nothing close to the "drinking herself into a stupor and rethinking her life choices" level we saw here.
Maybe she thought whatever happened between her and Chuck was something he'd keep silent about and thus Grace knowing about it has shattered that assumption. Personally I doubt that, but I don't think we know enough to speculate meaningfully on just what happened between them, nor on what Grace actually knows. Hopefully we'll learn more in the next update, but it's possible Victoria will be less talkative in the cold light of day, and the MC might have to wait until after the Exhibition to revisit it. We'll just have to see what happens.