Weird to see Graham take AOC's quote out of context:

Graham: So you can imagine how astonished I was last month when an American politician said that it was impossible to earn a billion dollars. I felt like a skating coach hearing someone say that it's impossible to do a triple axel. Of course it's possible. It's hard, but it's possible.

Per his link in the article:

AOC: there is a certain level of wealth and accumulation that is unearned. You can’t earn a billion dollars. You just can’t earn that. You can get market power, you can break rules, you can abuse labor laws, you can pay people less than what they’re worth, but you can’t earn

That billion dollars had to come from somewhere, and it definitely didn't happen from a single individual's hard work. A lot of people were involved in that over a long period of time. It's also weird to attach an emotional term like "earned" to that. You can say someone passively earned income, or an investor earned a return on their investment. That's clearly not the same meaning AOC implies when she uses it. So, yea. I'm pretty sure Graham and AOC are both talking past each other.

What's inaccurate in how he quoted her? The context seems fully consistent with the quote.

Yeah he weirdly dodges it. Completely unnecessary too, because he could've just said something like "the average american male yields roughly 90k hours of labor over their lifetime before retirement, so earning a billion dollars only requires an hourly rate of about $12k - It's hard, but it's not impossible".

Of course when you put it like that it sounds completely ridiculous :)