I'm not adding this to make fun of the individual, but to highlight that it's still a very dangerous virus to dice with. Part of fighting any virus is to alleviate the stress on the body while it copes naturally, which is what part of the focus of treatment is. This guy thought his strength and fitness would carry him through with some oxygen, but the stress on his body led to cardiac arrest and death. Which is a common way it can end you.
https://www.dailymail.co.uk/news/art...rged-dies.html
Get vaccinated, and if you need to be in hospital, go there and let them help.