Except the 6 and 20 numbers are ones you just made up to support your position and make yourself feel warm inside but this fact just makes your entire statement meaningless and at the center of your grin at your own wit is an empty, hollow nothing.
His point was that two processes can result in the same outcome when dependent on more factors than just the quality of the process. That doesn't mean that you shouldn't use the better process, just that it does not guarantee a better outcome. Only a better chance of a better outcome.
Though, based on the actual data we have, his numbers aren't bad for cases, and would need to be shifted to a dice with a lot more sides than a d20 for hospitalizations and deaths.