The wealth of the top 4 richest people is ~300 billion, he's way off.

I've took it from [0]. It does seems like numbers are very approximate everywhere, but even than, let's take 29 trillion and distribute it between 327 million population: we get 88.6k$ per person, still not enough to buy housing in most parts of US.

- [0] https://www.businessinsider.com/the-1-percent-dont-know-what...

Only if you think of single-occupancy homes. A married couple with 2 kids will be around 350k USD, peanuts for California but enough to buy a home for the family in many places in the US.