I read this to mean that the 90% mortality rate was reduced to a 60% mortality rate.
It is worded such that the intent is not to say there has been a 60% drop in the 90% figure. The new figure is simply 60%.
And the death rate of the outbreak that began in March is 60 percent,...
Oh I am so relieved, with the death rate being only 60% just over half of us will die if these idiot doctors make a mistake instead of virtually everybody in the country. The arrogance is breathtaking!