I don't really know the French legal system but I'm pretty intimately familiar with health and healthcare law in the US. While there's not a lot of information in the Bloomberg article, I'm fairly certain "doubling down on efforts to ensure worker safety" is not enough. (It's possible the court gave an actual list of steps that need to be taken in that regard? But if it did, that was not highlighted in the article.)
Bottom line, based on the little that was in the article, if coronavirus shows up in your facility despite your doubled down efforts you're still liable. A court of law is a court of law in the US. The liability would be with you. Again, maybe there was some more clear instruction given? But if not, there's a lot of rope there to hang yourself with. Best to just stop doing business in that jurisdiction. At least until you have a better idea what's going on.
Bottom line, based on the little that was in the article, if coronavirus shows up in your facility despite your doubled down efforts you're still liable. A court of law is a court of law in the US. The liability would be with you. Again, maybe there was some more clear instruction given? But if not, there's a lot of rope there to hang yourself with. Best to just stop doing business in that jurisdiction. At least until you have a better idea what's going on.