A death rate of 4-5 per 200 workers is highly unlikely. According to CDC data the infection fatality rate in a mostly unvaccinated population was 0.06% for the 18-49 age group and 0.6% for the 50-64 age group. The majority of deaths have been among older age groups, who are mostly not working at companies.

https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/burd...

Fortunately vaccination provides good protection against death.