Ann: Results from Data Confirmation Study, page-38

Because Pfizer understand this is a learning algorithm. That's why Pfizer were still make a lower offer if the specificity wasn't quite there yet. The more data you put in the better it will become. Just because it is still learning and refining the COVID cough recognition now doesn't mean it won't work tomorrow.

They state in the announcement that they already have an additional 1300 cough recordings since the test data was collected that is being used to improve the recognition algorithm.