Delta was the dominant variant only by end of July so the data set for the 0.1 number could have been based mostly on a virus which is 2.5x less deadly. We're

Delta was the dominant variant only by end of July so the data set for the 0.1 number could have been based mostly on a virus which is 2.5x less deadly. We're now facing an endemic virus which, even with vaccination, approaches (or could get as bad as) the deadliness of the flu.