So how does this wealth tax work? Are stock holdings taxed? Stock quantity doesn’t magically go up unlike fiat currency which governments just print more of.

None of these numbers make any sense in terms of how capital actually works. Is the government meant to take the profit in stocks? Because these billionaires aren’t selling that much stock each year and aren’t earning that much from CEO paychecks.

Not to say CEO paychecks aren’t obscene…

And what do you do when they pack up and move themselves and their companies to tax havens?

I have a house. I say have because while I have the title to the house, the bank has a lien that basically means they own it. Like a stock, my house increases in value. The government in my state then taxes me on the value of the house. Taxing me on unrealized gains in the house (I have not sold it) is like taxing a rich person on the unrealized gains of stock (that they have not sold).

It is possible to come up with ways to tax stock. It will be imperfect like all tax systems are. It will be better than what we have now.