You can debate whether the system works well, but it isn’t accurate to say there’s no evidence for the claim that the working classes play a central role in the Chinese state.

China’s constitution explicitly defines the PRC as a socialist state “led by the working class and based on the alliance of workers and peasants,” with state power exercised through the National People’s Congress (NPC) system. The NPC is the highest organ of state power, with nearly 3,000 deputies drawn from provinces, the PLA, and different social sectors.

The makeup of the NPC is not just party bureaucrats or business elites. In the 14th NPC there are hundreds of deputies from workers and farmers and large numbers of grassroots representatives, along with 442 ethnic minority deputies covering all 55 minority groups. Most deputies in China’s people’s congress system (about 95%) serve at the county and township level, which are directly elected and involve hundreds of millions of voters. Higher congresses are elected from these lower levels. This structure is what China calls “whole-process people’s democracy.” Sources explaining the system include CGTN’s Who runs the CPC and the State Council white paper China: Democracy That Works.

You can also look at how the state treats capital. China has private capital, but it is clearly subordinated to state goals. When Jack Ma tried to push an aggressive fintech model through Ant Group that would massively expand lightly regulated consumer credit, regulators halted the IPO and forced restructuring under stricter oversight. That is a case of disciplining capital when it conflicts with social stability and the broader economy.

Likewise, China has pursued policies like eliminating extreme poverty and building massive infrastructure networks (including projects that are not monetarily profitable) because they are treated as long-term public development goals. That kind of large-scale, socially oriented investment is difficult to sustain in systems where private capital dominates the state.

So you can disagree with the Chinese model, but there is actually a large amount of Chinese material explaining how their system is supposed to function and why they claim it represents working-class political power.

Sure!

The Chinese political system is based on whole-process people's democracy, a form of consultative democracy. The local government is directly elected, and then these governments elect people to higher rungs, meaning any candidate at the top level must have worked their way up from the bottom and directly proved themselves. Moreover, the economy in the PRC is socialist, with public ownership as the principle aspect of the economy. Combining this consultative, ground-up democracy with top-down economic planning is the key to China's success.

I highly recommend Roland Boer's Socialism in Power: On the History and Theory of Socialist Governance. Socialist democracy has been imperfect, but has gone through a number of changes and adaptations over the years as we've learned more from testing theory to practice. Boer goes over the history behind socialist democracy in this textbook.

The working classes in socialist countries are the ones dictating the state and its direction.

It isn't an ad hominem fallacy to point out that doing little research on a topic and repeating easily disproven talking points isn't a sound basis of argument.

Least insufferable redditer

Not an adhominem. You're not wrong because you're stupid you just happen to be both wrong and stupid.