I can only comment on the study in front of me, and not the use cases that 'might have been'. In this case, they tested in a healthcare setting as there is a pr

I can only comment on the study in front of me, and not the use cases that 'might have been'. In this case, they tested in a healthcare setting as there is a presumed higher risk of catching covid amongst participants. Would the same false positive rate be true in the community, where transmission is much lower? We don't know because that wasn't the experiment. The study authors claim that this is useful in the healthcare setting- I'm saying that it's useless because there are better tools in the arsenal (lateral flow tests), and watches are an infection risk.