This only works if you assuming the mortality rates are evenly distributed. Most of the people who die are not working right until the end—and the conditions which lead to them dying usually aren’t compatible with a demanding job.
You are correct that it is a rough estimate but my point stands. While most of us will never experience the shock of someone dying at work, it is an every day occurrence at the scale of Amazon.
You have provided no evidence supporting that belief and brushing aside the obvious challenges makes it hard to believe you have done the math. I’d also note that if this was actually true, it would be more surprising that they didn’t have a policy for dealing with it and had to improvise on the fly.
