It's not like Americans are known for taking particularly good care of themselves.
I'm not sure of any scenario once community spread was rampant across the nation where substantial numbers of Americans wouldn't have died.
Let's not forget this nation has been supposedly battling an "obesity epidemic" for pretty much my entire adult life (I'm >40), and the fact that Dialysis centers have become a common sight throughout the nation. These problems existed prior to COVID-19, in many ways this is Americans sleeping in their own bed decades in the making.
Or perhaps you're you're interpreting the parent comment overliterally? I understood it to mean that Coronavirus restrictions are safety theater, not that the virus itself is a fantasy.