Technically you're right, the MC doesn't
know Quinn is pimping the HOTs unless he signs up for the restaurant. But who else would she be offering? The way she phrases the offer suggests she isn't on the menu herself, and the MC doesn't know about the Pink Rose yet. We know the MC is worried that Quinn might use Maya "like she's using Camila" so the MC has clearly connected those dots even on non-restaurant runs.
Which is what makes the MC's cryptic warning so frustrating.
No, Quinn being VP is explicitly stated early on:
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We also know that the MC knows who Quinn is because he and Derek refer to her by name after she steals their clothes:
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As we keep saying, the MC told Maya that Quinn was evil, but not why or how she was evil, much less provide any anecdotal data to support the claim. Honestly, it would have been better just to have the MC say nothing if his warning was going to be this half-assed.
Technically the following are spoilers, but IMHO going into
Acting Lessons blind is asking for trouble and I'll try to steer clear of direct plot spoilers.
Acting Lessons has a serious tone shift in the last quarter. The game suddenly becomes
very dark, and the final act is spent watching what's left of the MC try to recover from the trauma he endured. Depending on how you play you can eventually overcome it and get a relatively 'good' ending given the situation, but it's still lightyears away from the way the game had been presenting itself for the first 6 episodes.
Now some people enjoy the twist, and conceptually I get it. IMHO the game is too heavy handed to work, but to each their own - the quality of the game otherwise is quite high. I just think you need to go in with your eyes open because otherwise the end can come across as a major bait-and-switch.