Wrong on every count. The annual wealth tax would have forced Elon to divest of his assets. Tesla and SpaceX would have disappeared as independent, vibrant assets, and US exceptionalism along with it. Many, many Americans would be far poorer today than they were then. And none of the poor would have seen a dime of the taxes (since the US and the States, in particular California, spend far more than they collect.) You can't cure dumb. For reference...see Europe.
If Bernie's 5% annual wealth tax on billionaires had been enacted in 2012, Elon Musk would be worth less than $365 billion instead of the $1.2 trillion that he's worth today.
Elon would still be the wealthiest man alive & every family in America would have universal childcare.