Flaw in computing the degree of protection provided by vaccine

 This article claims that the vaccine prevents 90% of deaths.

https://www.forbes.com/sites/masonbissada/2021/10/20/vaccines-90-effective-at-preventing-death-from-covid-19-country-wide-study-suggests/?fbclid=IwAR1RTYajpRgOn5-_W9iuURQHBpElhILSEipS3OURkXlh5m1nVHucu_vzELI&sh=4bbdc4db657c

However it has a flaw.

I explain my reasoning here:

https://tklcloud.com/Feedback/feedback2.aspx?id=4997