Your hypothetical of the actions of shorters and investment banks is akin to a description of the activities of ants under a compost heap in comparison to the stimulus Xi is about to unleash in order to arrest wealth destruction of ordinary citizens from the implosion of China's property market, and the subsequent deflationary spiral which threatens the CCP.
Last week the Peoples Bank of China announced measures that is isolation will not work, and achieve the sound of one hand clapping i.e a logical absurdity. Strenuous fiscal stimulus is required to compliment PBOC measures. Chinese officials have alluded to such stimulus in recent days.
The bad news for shorters you champion is that Xi has occasion to announce fiscal measures at the upcoming National Peoples Congress later this month.
Don't hold your breath for a near-term opportunity to short after that. You are guaranteed to asphyxiate.
(20min delay)