The Chinese continent has a long history, but it is not the history of China as a country. It would be strange if the United States of America called the history of native indigenous peoples "4,000 years of American history", wouldn't it?
The Xia, Shang, Sui, Tang, Liao, Jin, Yuan and Qing dynasties were ruled by different ethnic groups, not Han Chinese.
The Chinese continent has a long history, but it is not the history of China as a country.
It would be strange if the United States of America called the history of indigenous peoples "4,000 years of American history", wouldn't it?
Similarly, there is no such thing as "4,000 years of Chinese history".