Looks to me like the central bankers are worried the outcome will be inflationary, or worse. Seems when gold goes up it turns out it was central bank buying of one sort or another.
For all practical purposes they have an unlimited budget to buy gold. It falls under what I call off balance sheet deficit spending. The central bankers buy in their own currency, paying for it with a credit to the account of the seller’s bank they enter on their own books. The gold is accounted for as the asset and the (new) funds credited the liability, no questions asked, no budget rules involved.