I see what you're getting at but that decision has little/nothing to do with Apple's stance on privacy.
* iMessage still uses end-to-end encryption for messages in China.
* iPhones sold in China still utilize Secure Enclave for privacy/encryption.
* Aggregate data still uses differential privacy in China.
The government made a request of them which did not compromise their user's security, and they obliged.
Compare that to when the US government requested backdoor access pass Secure Enclave and they absolutely denied that request.
I agree that it's unfortunate for Chinese users that their government is placing additional limits on the available software in that ecosystem (as well as other ecosystems, I'm sure). But so long as the government is not asking Apple to compromise its users privacy I don't see any strong relation to corroborate the idea: "privacy matters, unless it's in your fastest-growing market".