One argument for not getting excited just yet: This was not a blinded clinical trial. The subjects all knew whether they have COVID-19 or not and knowing how s

One argument for not getting excited just yet: This was not a blinded clinical trial. The subjects all knew whether they have COVID-19 or not and knowing how strong psychological effects can be, what's detectable in their cough might be their knowledge they're sick. The researchers even acknowledge in the paper that "sentiment" is a big part of how a forced cough sounds. What's worrying is also how little of the data was from a diagnostic test (over half of "positive" samples were "self-diagnosed" COVID-19, whatever that means). I don't think FDA or any other regulatory body would accept such an app as a screening tool without a proper trial being done. If it works, that would be the most practical and coolest application of ML I've seen - but it still feels like something from the "too good to be true" category at the moment.