From the article linked above:
"According to The Week, after CEO Elon Musk tweeted March 31st that he had “extra FDA-approved ventilators” ready to ship out, Tesla didn’t ship out actual ventilators, it sent machines more closely related to C-PAP devices called BiPAP or B-PAP machines, made by ResMed. C-PAP and Bi-PAP devices are indeed used in hospitals for medical breathing issues, as well as in homes for ailments such as sleep apnea. They use a mask that covers the users entire face or just the nose and mouth, but they are not effective for the critical symptoms of COVID-19, which requires ventilators that include intubation, or the insertion of tubes into the lungs of the patient."