Even more must have been collected with PCR tests
why is that an issue? aren't villains known for their lack of care for their henchmen[1]? Also, apparently covid isn't really transmitted via physical contact[2], so operating such a lab probably isn't too dangerous. Finally, presumably there's PPE to protect against this sort of stuff, if you're not the type of villain that mistreats their henchmen.
[1] https://tvtropes.org/pmwiki/pmwiki.php/Main/BadBoss
[2] https://www.cdc.gov/coronavirus/2019-ncov/more/science-and-r...
https://inews.co.uk/news/covid-testing-provider-investigated...