If one reaches the point of needing a ventillator, one is extremely ill, and therefore more likely to die.
Very often, had a patient been given a CPAP device, the patient would not have progressed to needing a ventillator.
A ventillator is a last ditch device to save a life. Too many people equate it to being a magic cure.

I don't think that's what this guy is getting at. He cites the UK study as showing 66% on ventilators died, meaning 34% lived. Although he doesn't say it, I think the implication is that data on the ones who died needs to be more available, so triage decisions can be better guided, if it comes to that. That is, some patients might be better helped with a ventilator, and others not, and having data to figure out which is which would help with triage.