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Xi['s] ... isolationist policies ... have killed China's economy.The PRC's GDP was US$17.7 trillion nominal in 02021, the latest year for which we have numbers, according to https://en.wikipedia.org/wiki/Economy_of_China. That makes it the world's second largest economy by nominal dollar value (after the US) and the largest by PPP. That's not just individual countries, either; it overtook the economy of the EU in nominal GDP in 02021 under Xi's leadership. The IMF's estimate for 02022 is US$20 trillion according to https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(nomi....
This isn't just a matter of domestic numbers that can be fudged, either. https://en.wikipedia.org/wiki/List_of_countries_by_exports says it exported US$3 trillion worth of goods in 02021, up from US$2.5 billion in 02020, making it the world's #1 exporter, with almost twice the exports of the US at #2, though by this measure the entire EU does still exceed PRC. (The EU is excluded from the list for not being a country.)
Nor is it just a question of adding together poverty-level earnings of 1.2 billion people. The PRC's per-capita GDP is US$20k PPP. Economically, the average Chinese person is doing fine, although they're experiencing a lot of unfortunate things outside the economic sphere.
China's economy is experiencing major difficulties (Evergrande, zero-COVID lockdowns) but it is far from being "killed" or a "return to Mao-style communism", by which I charitably assume you mean 01970s-style stagnation and not, for example, the largest famine in human history.
You should take a long hard look at where you're getting your information from and how you decide what information is trustworthy.