Actually, this town has more than enough room for the two of us
He/him or they/them, doesn't matter too much
Marxist-Leninist ☭
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If your stance is that administration and managers are incompatible with socialism, and that democratically elected representatives are not a genuine form of democracy for the people, then your stance is that Marxism in general isn't socialist to begin with. I think this is more of a semantical argument than a moral or logical one, if I ceded that Marxism isn't socialist by your definition that says nothing about whether or not Marxism is a sound framework and that Marxist "socialism" is something worth pursuing.
Further, I don't see how you could have large-scale society while requiring every decision to be made collectively, so either you're pushing for the small-scale commune model with individual or small cooperative production, or there's something else you agree with that I'm not aware of. Most anarchists recognize "justified" hierarchies of some sort to get around this issue, usually with different models like participatory economics, but I do understand that the maximally horizontalist anarchists do also exist.
As for how decisionmaking is made in the PRC, it depends on the scale. Much of the larger decisions are made centrally at the level of the NPC, but local decisions are often made directly through township councils or regional councils. It works well for its people, which is why it gets such widespread support.