You’re making a lot of assumptions. Sure, if the reported death rate is correct (it isn’t; it’s going to end up much lower), and the medical system in Wuhan is

You’re making a lot of assumptions. Sure, if the reported death rate is correct (it isn’t; it’s going to end up much lower), and the medical system in Wuhan is up to first-world standards (it isn’t; they’ve had to scramble to build halfway adequate infrastructure for the population), and the distribution of victims is the same as the 1918 flu (it isn’t; this virus kills mainly old, sick people), then sure, you can just compare mortality rates. But since none of those things are true, you can’t. It’s not like these parameters are fixed; they’re dramatically affected by the time and context in which they’re measured.