“According to the comprehensive average estimate, the national infection rate has exceeded 40%, which means that the number of infected people in the country is at least 560 million people, approaching or even exceeding 600 million people.”
And, if the fatality rate is as low as 0.01, then expect 6 million deaths.
It is age related:
In a report from the Chinese Center for Disease Control and Prevention, case fatality rates were 8 and 15 percent among those aged 70 to 79 years and 80 years or older, respectively, in contrast to the 2.3 percent case fatality rate among the entire cohort [27].
https://www.uptodate.com/contents/covid-19-clinical-features
Today we have a big experiment in China, going from total lockdown to nothing. We will see the result in a week or so.