Congress cannot shield employers from liability in COVID cases. Lawsuits over injuries and torts are adjudicated in state courts in almost every circumstance. Each state would have to pass its own variation of an employer immunity law, and we know that simply ain’t going to happen
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So why was McConnell and the Senate Republicans so eager to pass this liability protection from COVID cases for businesses last year as part of the stimulus packages last year? They weren’t just talking out of their collective asses. Sure adjudicated in state courts, but must defer to federal law. Unless you personally know something that these mainly lawyers in Congress don’t know.
They were proposing to use the same strategy that's ALWAYS used whenever the Federal government wants to impose its will on states in matters where the Federal government has no authority.
The item I highlighted in bold above should have been the biggest clue for you. Under the GOP plan, any state that wanted to receive Federal COVID money would have been required provide this liability protection under its own laws as a condition of getting the COVID money.
That was simply never going to happen under any circumstances no matter how hard the Chamber of Commerce GOP tried.