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3% fatality rate with appropriate (if not the best available) medical attention and resources

What website are you referring to?

My comment was driven by my own experience with process estimation, though other commenters have pointed out that it's also supported by research on SARS: https://academic.oup.com/aje/article/162/5/479/82647

I would expect a dismissal of a website as inaccurate garbage to be supported by a better counter-argument than a "completely off the cuff, uneducated guess."