It may be no more deadly than the flu with appropriate care, but many more people seem to require that care than the flu. This is probably because it goes after the respiratory system, causing issues that require costly and labor intensive intervention. The flu might make you feel like total shit but it generally does not mess with respiration much, allowing many more patients to just wait it out in bed.

Italy has more hospital beds per capita than the US. Check out their condition.

You have to look at whole systems and the long game. Quarantine is about keeping the medical system up until we have drugs and hopefully vaccines not only developed but in production.

Elon is great at whole systems analysis. Not sure why he can't see this.