996 was declared illegal in 2021, and was mainly in large tech companies, certainly not the norm even before 2021. Meanwhile, the state executes billionaires and capitalists found guilty of corruption. Unions are entirely legal, they just have to be a part of the All-China Federation of Trade Unions, and not rogue. Marxism is studied in China, you can even get a college degree in it. Workers and students and their rights are defended and protected by the socialist system.
Can you explain exactly what you mean? It's a mixture of half-truths and outright lies, and the half-truths deliberately leave out context and reasoning, such as the All-China Federation of Trade Unions existing as a sort of union of unions, China hasn't made unions illegal. Your entire comment was unsourced, too.