Actually occupancy is likely somewhere between 10-20k

https://www.snopes.com/fact-check/china-apartment-building-residents/

That’s bigger than my entire village 😳

Such buildings allow for great efficiency (it probably has its own stop on some kind of rail transit and still a reasonable cost of living) and that includes pizza delivery. Imagine delivering multiple orders a minute. The salary (and tips, even outside the US) would be great. They will probably even allow you to call the elevator with an app before you walk to it for extra speed.

Food is delivered by pneumatic tubes.

Enjoy your pizza all scrambled and your soda is gonna go through nuclear fission 💥

Poor delivery guy 📦 😰😂