Your numbers are incorrect. The ~40,000,000 number represents cases confirmed through administered tests. The true number is probably somewhere closer to ~150,000,000[0]. Your comment is based on an incorrect assumption.

[0]: https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/burd... (the estimates here do not account for infections before February 2020 or after May 2021, which means all early infections as well as the "delta surge" are unaccounted for).