[davvolun]

Going off the article alone, it would be hard to notice this, but the conclusions of the actual study are based on patients with a final results (either death or discharge), but that only includes about 46% of the cases. Specifically, as noted by ivanonymous, that's only including 320 patients on ventilators who died or were discharged versus 861 still on ventilators. If all 861 patients recover, that 90% would drop massively (it's hard to say how much without breaking the numbers down more completely).