The link you provided contains nothing about not being in the top 10 for natural disasters.

This Wikipedia links, however, does:

https://en.wikipedia.org/wiki/List_of_natural_disasters_by_death_toll

And it shows it is right in line with the earthquake death tolls.

There is some decent rationale to exclude modern floods from being natural disasters as, the floods are usually caused by a failure of a man-made dam or canal system, and not by the floods by themselves.

And all of these are overwhelmed by pandemics, several of which have killed a serious percentage of the worldwide population. The Black Death killed 17- 54% of of the entire human population, Plague of Justinian 7-56% of the world population, and the Spanish Flu killed as much as 5% of the world population, and managed to spread to every continent and all populated islands, killing people everywhere in the world except Samoa.

https://en.wikipedia.org/wiki/List_of_epidemics