What he does for hyperbole is say that all one needs to become a billionaire is make something people want. It’s that simple. There are of course many non-billionaires who make food or write code that people love. There is more than one path to a billion, but many of them involve employing the people making loved products and services and putting one or many layers in between. The billion is largely not possible from just making it. The layers attract cheating. Some might also argue it's wrong to say the billionaire's path involved the making of the thing people love anyway.
This is not unlike a sibling commenter who hypothesizes earning a $50k margin building a home and all you need to do is do it 20k times. There’s a lot in between doing it once and 20k times. The path has many places where cheating will make things easier and possibly required. If the leader avoids the temptation, their employees may not, society may not. If their competitors cheat and they don't, we should applaud them, but they might not be a billionaire then and we can't count them. I'd guess this is a common way potential billionaires do not become billionaires. It probably catches lots of people getting to a million and then more at ten million and then more.
There's a certain amount of "in theory you could make a billion", that's different than whether we have billionaires that didn't cheat. I think it’s worth noting that you are engaging with the issue in a way that he didn’t. This was the primary argument I was making.
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If you soften your definition of cheating to this level, it's no longer a billionaire thing. It's an everyone thing.