I've already responded to this but

1. She didn't rule out sharing in the wine conversation. Just not tonight. And that was written almost 3 years in patch 1

2. Yes, a poly person who only wanted to be the primary partner would say that.

Could the writing of those be improved? Sure. But I would want it go in a very different direction than you seem to want it to go.

You are right that sex workers bit was porn. But SH being poly? I always expected that.