How could you possibly know that? Sure maybe none of the people who worked at Tesla died from COVID, but what about their families? What about every single person in public they interacted with? There is no way to know how many people, if any, they spread the virus to, who then died, and whether they got the virus at work.

But we do know that states with more lockdowns had lower excess deaths. So in the aggregate we know that lockdowns saved lives.