Hundreds of thousands are also never being tested, so we've no idea how many actually had it in the first place, though I'm sure some deaths are being attributed to other causes too.
The most obvious thing is that we have little idea of any of the actual numbers, the official number of getting it world wide is just over 156,000, the real number could be 10 times that or more.
Exactly, there's no way anyone that knowledgeable would simply claim that deaths/confirmed cases is the exact death rate, it just doesn't work that way and everyone knows it.