Chinese officials are not at billionaires level, millionaires at most. It’ll be a huge risk to their political life if they and their families possess billions. It’s very likely they could control multiple billionaires though
https://www.smh.com.au/world/chinese-leaders-family-worth-a-...
https://www.nytimes.com/2014/06/18/world/asia/chinas-preside...
And do you remember that discussion about Wen Jiabao's mom controlling a good chunk of China's jewelry industry that got the new york times banned:
https://www.nytimes.com/2012/10/26/business/global/family-of...
I think Chinese officials are genuinely surprised in how poor western politicians are and how many of them even lack xiaosans.