The point of the exercise is based on a fundamental understanding of wealth vs incomes. There is nothing to miss because the whole point pushes a misinformed narrative that makes you think billionaires have cash to just take.
The fundamental nested misunderstanding is that the wealth vs income misunderstanding doesn't matter unless you're making a finicky point about the way equities work.
It absolutely matters because it chances the whole concept to retaxing more of peoples existing assets just because they appreciated in value. People for wealth taxes muddy this because the support for taxing things before any gains are realized is really thin.
Unless they want to buy Twitter, then somehow it transfers.