It's different though. Zhou is a good driver, and by 26 will have sone experience, but mostly developing a middling F1 car at best.
Bottas is also good, perhaps has less potential as a driver given his age, but he's experienced the development of some of the most dominant championship winning cars ever. Bottas has demonstrated great single lap pace in those cars, and knows what those last tenths feel like.
Not saying they should or will keep Bottas, but it's not out of the question. Simple fact remains that he will need to beat his teammates during the coming years though.
Chinese customers are not interested in overpriced German cars. Their regional suppliers offer design copies for way less. Volkswagen has dropped prices so much, that the same car in Europe costs like 30% more. Helps that they build them in china too. Audi Motorsport, or Quattro as a brand is in no man’s land in china anyway. Bottas driving a shitbox. If you’d put Zhou in the second Red Bull he would perform like every other race driver in that seat, bar his mental health limiting his confidence. These drivers are within margin the same but limited to their teams, machinery and confidence.
You're making a case for why making them interested in overpriced cars is a good idea. F1 is advertising and that's never about explaining what people need but what they think they need.