It's based on 282 deaths among the 320 ventilated patients who either died or were discharged.
But 831 patients were still on ventilators!
It's a snapshot taken too soon.
Estimates of mortality on vents very widely still, partly because of real underlying variation in practices or population, partly because the data is really messy.
This email series from Mass General is a good orientation (discusses this study, links to discussions of previous studies): https://mailchi.mp/db30d9d2cb24/tz4idnzryr-4406129?e=acf498e...
Any vent strategy being debated on Twitter (early! late! APRV!) is also being discussed by working pulmonary critical care docs. Judging those discussions or the variations in practice as an outsider is hard. But relative silence on Twitter doesn't equal mindless orthodoxy.