The low rate of deaths in the rest of China shows that the lockdown of Wuhan works. The rest of China never had that many cases.

Death being concentrated in one region is not an exclusive phenomenon in China. If you look at Korea's stats you'll realize there many provinces with zero deaths[1]:

Incheon: 58 cases, 0 death Seoul: 426 cases, 0 death Gyeongnam 95 cases, 0 death Ulsan: 45 cases, 0 death Chungbok: 44 cases, 0 death Sejong 46 cases, 0 death Deajeon: 45 cases, 0 death Chungnam: 127 cases, 0 death Jeonbuk: 13 cases, 0 death Gwangju: 20 cases, 0 death Jeonam: 9 cases, 0 death Jeju: 9 cases, 0 death Airports: 202 cases, 0 death

Deaths are only concentrated in 5 regions:

Daegu: 6624 cases, 111 deaths Gyeongbuk: 1298 cases, 38 deaths Gyeonggi: 463 cases, 5 deaths, Busan: 118 cases, 3 deaths Gangwon: 36 cases, 1 death

[1]https://en.wikipedia.org/wiki/2020_coronavirus_pandemic_in_S...