I wouldn't say it's lethal, at least not for everyone. The last report from Italy has stats on 2000 deaths. No deaths under age of 30 and only a few under 50, all with pre-existing health conditions. Women's median age close to 84. Men's 80. And vast majority of deaths are people with multiple pre-existing health conditions.
It could be because the application of medical care is skewed towards the young, such that they survive and those older or with less chance of surviving die.
If you can reduce the demand on hospital services, then you might have enough resources to treat those high mortality cases, and under those circumstances they may survive.
