It's a naive article and an insane idea with disastrous ramifications. A 1% wealth tax on the top 1% is going to cost jobs and I'll tell you why. It doesn't differentiate between pure liquid cash wealth and assets invested in job creation and job maintenance.
A restaurateur with three restaurants in, let's say, NYC is going to have a business valuation, of, let's say conservatively - $45M. That will place him in the top 1%. Most of his "wealth" is tied up in his three restaurants - building, equipment, etc.. Even if he leases the building and each one of his restaurants has gross revenues of $3M - each individual restaurant is going to be valued as a multiplier; lets say 5.
So each year, this guy is going to have to come up with $450,000 on top of everything else in order to pay this "wealth tax". Where's he going to get that? Remember that gross revenues are before expenses. All of his money is tied up in his restaurants. Even if he pays himself a salary of $900,000 per year - he's going to have to either take a 50% pay cut or he's going to have to fire staff or sell a restaurant.
What about a successful independent automotive garage owner? He's got $7M tied up in real estate, tools, equipment, and lifts. His equipment costs are huge. Let's say that he wants to expand and add another garage location. His accountant tells him no way. His garage is valued at 5 times annual revenue, and if he adds another garage he'll have to pay $500,000 each year as a wealth tax. And he might only pay himself $250,000 per year at present because his materials costs are so high.