My wife is Chinese. She has told me that she can read and understand written words found in ancient Chinese records 5000 years old.
I agree that China has a very ancient culture. But it had many, many incursions from the steppe bringing in new blood, with the Mongols and Manchus only the most recent.
Chinese ideograms are astonishingly conservative, because they don’t have to change with the pronunciation of the language.
But I suspect Chinese of today would have a lot less in common with those of the early Chou dynasty than today’s Jews with King David.