You can't draw this conclusion from the linked study due to how the sample was constructed. "In this retrospective, multicentre cohort study, we included all a

You can't draw this conclusion from the linked study due to how the sample was constructed. "In this retrospective, multicentre cohort study, we included all adult inpatients (≥18 years old) with laboratory confirmed COVID-19 from Jinyintan Hospital and Wuhan Pulmonary Hospital (Wuhan, China) who had been discharged or had died by Jan 31, 2020." There might be a bunch of patients who needed ventilation and went on to survive, but had not been discharged before the cut-off date.