一个英语定语从句的问题The word tuhao used to mean rural landlords who o

一个英语定语从句的问题
The word tuhao used to mean rural landlords who oppress their tenants and servants, while now it refers to people spending money without limits or those showing off all around.
我的疑问people(that?还是who？）spending money without limits or those showing off all around.
这句话是句定语从句吧，我想问一下省略的是that还是who，语法不太好.问一下 并说一下为什么不是另一个，谢谢