“The real richest man in China ... " Does this sentence sound natural?
The real richest man in China is one of those the value of whose assets you never know and you are not even allowed to talk about publicly.

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I would just say "The richest man..."

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What about, "The actual richest man (men)..."?

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Try this:

He who is truly the richest man in China is probably one whose wealth we are not allowed publicly to discuss and whose net worth is shrouded in mystery.