ResMed does not make ventilators approved for hospital use or the treatment of COVID19 patients, which they point out on their website. https://www.resmed.com/en-us/sleep-apnea/cpap-products/cpap-...
As ResMed notes, while their CPAP machines are useful for those with breathing difficulties, they cannot safely be reused between patients. Meaning every CPAP machine provided by Tesla to hospitals can only be used on one COVID19 patient.
So, they're better than nothing but still an example of Tesla/Musk saying one thing, borking the execution of that one thing, and then congratulating themselves for failing to do what they claimed they would do.