The only thing in your statement that provides evidence of instability is your arbitrary inclusion of the adjective "desperately" to describe China's actions.
All governments work towards stability in their own ways. I don't see desperation in Chinese strategy, but I do see a lot of energy.
You are free to use any word to describe it, you could also call it "expense." China is spending time and energy on suppressing dissent proportional to their fear of their own people. The CCP has decided that the risk of being deposed is high enough to justify the cost and effort required to implement all of those nightmarish schemes.
All governments work towards stability in their own ways. I don't see desperation in Chinese strategy, but I do see a lot of energy.