Means a 2% wealth tax combined with a 50% income tax, dividend tax, capital gains tax or whatever ends up being a 4% wealth tax effectively.
Example: You own stock worth $1,000,000 and the government wants 2% wealth tax from you which means $20,000. But to get that $20,000 you have to sell $40,000 worth of stock and pay 50% income tax for that sale and the government ends up taking 40,000$ effectively.