Well, that 4600 number was derived statistically by looking at a small sample and extrapolating...probably not hugely accurate, but def more in line with reality that the 65 or whatever were “officially” killed. Pretty insane considering it was the US in 2017.
Im guessing we will never know the “real” toll. And you are so right that our civilization, or at least the US part, is lining up for some monster catastrophes. Either a hurricane, or a Pacific coast volcanic deal, or an earthquake, or ...God help us...a Yellowstone caldera...