Provisional data.
Backward revision.
ADP missed payroll projection recently. They reported a loss of 475,000 jobs, then revised it up to a gain of 509,000.
600,000 people go missing each year: https://namus.nij.ojp.gov/
These numbers are sloppy as hell.
Based on the numbers you provided (deaths of 3.3 million). The US had 3.6 million births in 2020.
That's a net population growth of only about 300,000, yet the Census population estimates from the end of 2019 to the end of 2020 show a net gain of 1,637,981
https://www2.census.gov/programs-surveys/popest/tables/2010-2019/national/totals/na-est2019-01.xlsx