Collider in RCT Subgroup Analysis

IMO the perceived need for oxygen or MV was a proxy for the virus/immune system induced hyper inflammatory state of a cause specific pulmonary disease. I think this was the general view. This creates a causal integrity RCT (CIR) of a pragmatic biologic data generating process (BDGP). The conclusion of this trial seems quite well supported from a clinical perspective. However I appreciate your depth of thinking relevant this trial.