I'm willing to wager the death rate is a large range from 20% to even 60%. With as many videos as there are about people just collapsing and dying in the streets from this virus, as well as the fact that they're building multiple hospitals purely for this virus and constantly spraying the city with tons of airborne bleach among other strange actions, it'd be hard for me to justify that there is less than a 20% death rate.
if it was 20% the world would be forgeted and quarantining would be taken way more seriously regardless of number of cases in said country. ie we'd have constant CDC warnings and probably freely distributed masks and such to prevent spread.
to put this into perspective: you're suggesting that 1 in 5 to 3 in 5 people die from getting the disease. if it was so, there would be at least one death in the USA rn with the 12 cases we have, if not more. and there would be far more in any other country that has more cases, like Japan which iirc has >50 cases but no deaths.
the reality is, based on the statistics outside of china, 2% is likely the accurate number. claiming the scientists/statisticians at these major institutions have no idea what they're talking about and are vastly underestimating the disease is purely fearmongering - what makes you and your number more proven/likely to be true than the one figured out by said institutions?