That's incredibly unlikely. Goes against the experience elsewhere especially among medical workers who were mostly healthy.
I knew that some health care workers had gotten sick. Maybe I missed it on my quick read through but I didn't see anything in your link to indicate that a single one of them came down with a case any more severe than needing to stay home from work for a few days while they recovered. Have ANY of the healthcare workers died?
You had made the claim that "The main reason is that there is significant mortality among healthy people (much higher than flu)." I haven't seen any evidence of mortality in previously healthy people being AT ALL significant, let alone MUCH HIGHER.
You are completely wrong about that. The mortality for COVID-19 is 0.5% for ages 15-44: https://www.researchsquare.com/article/rs-17453/v1 For flu the mortality for ages 18-49 is 0.02% https://www.cdc.gov/flu/about/burden/2017-2018.htm That's 25 times higher. But based on overall mortality in all ages with our better hospitals it will probably end up around 10 times higher.