I'm sticking to my math. No antibodies, breaking into areas it never existed before.The flu goes from zero activity to high activity in about 3 weeks. Cvirus is everywhere in China by now, its been 6 weeks. It has been half a flu season and there have been 40k infections, and 1000 dead. Meanwhile in 12 weeks flu will kill 80k, and infect 80 million. Remember Flu is a seasonal thing and drops to almost nothing for 3/4 of the year. You and I are likely to die from complications of the flu or another virus...maybe because of cancer or heart disease or diabetes...but a virus is likely to be the final bullet. Maybe it is a specially designed virus that is super contagious, those were created by the russians and it maybe escaped from Wuhan. The spanish flu would immobilize communities due to illness. this is immobilizing due to fear.
Flus often sprout up in varying areas, not just one, as those flus are already there, dormant in those who carry it, but, as you said arent weak enough for it to take hold in its virulent form, in a way, and they start infecting people from multiple areas. Again, not just one.
So, having an area of one hundred million is one fourteenth the population of china, if onehundred start dying each day, and it expands into areas it's never existed before, unlike the common flus, that's fourteen times the ability potential including mortality, or, 1400 a day, and it too is just getting started, no antibodies.