Whoever wrote this article left the impression that this ETF and its investors has a choice about how much gold it holds. It must liquidate holdings when the price declines, and vice versa when it appreciates. It is a fixed investment pool that must adjust the size of its holdings to the dollar value of gold.
This ETF reflects the price of other gold investors that collectively set the price. It amplifies any move by adding or subtracting ounces from and to its account - and seems to add to the volatility of this commodity since its creation.
It is not the same as futures selling or central bank selling.