I have not seen any scientific-medical reports that someone has "died from Covid-19"!
https://www.bbc.com/news/health-51214864
"Inflammation of the lungs is called pneumonia."
The medical justification for assisted breathing is the virus cells first attack cells in the lung (breathed in!) and the oxygen is an "anti-body" if you will to assist the lung cells (which need oxygen) to survive (stave off) the attack.
The "death reports" attributed to "Covid-19" are a blend of political and economic benefits to those who desire to gain political and/or financial advantage from attaching the "label" on the cause/manner of death that will further their particular agenda ... be it political or financial or both. The pharma research on "killer cells" began round 2005, but some mainstream nedia "believers" want to politicize it and thereby weaponize it.
Who are best to develop quickly a vaccine for the cell?