No they aren't. The probability of a healthy person dying from COVID is so low as to be statistically insignificant.
US stats:
https://www.cdc.gov/nchs/nvss/vsrr/covid_weekly/index.htm#Comorbidities6% of deaths had no underlying health conditions.
UK stats:
https://www.ons.gov.uk/aboutus/transparencyandgovernance/freedomofinformationfoi/covid19deathswithandwithoutpreexistingconditions8.9% of deaths had no underlying health conditions.
I am still waiting for your reply from when I cited a study of 10 million people done in Wuhan, China. Is a study of 10 million people in the place where the epidemic originated scientific enough for you? Here I quote it back to you, I've been waiting almost two months for a response:
Because the study you quoted proves my point.
Jet Cash said "Natural immunity has 100% success". I said "COVID reinfections do happen". You then linked a study which shows reinfections happening. Not sure what I'm supposed to respond to. It's a small number, yes, but reinfections
do happen.