Worldwide price deflation - world wide currency appreciation- would of course lower the price of gold, however as m22au points out there is no mention of such deflation in the article. Most likely, a sell-off in gold simply suggests that some appreciation of the dollar relative to other currencies is expected--since gold is priced in U.S. dollars. And also, since gold has already seen a considerable run-up, there are bound to be some who are worried about hanging out too long at the trough. Coincidentally, an appreciating dollar relative to the Euro and Yen should also help stabilize equity prices in dollars and even bring them down some.
Personally, I am expecting continued very slow strengthening of the dollar relative to the euro, as I think the Europeans will eventually be forced to adopt U.S. style easing, as austerity measures are counterproductive when faced with a recession. The latter measures just put more people out of work, lower consumer spending, and reduce revenues, making deficits worse! Keynes understood that, and most economists today understand that. But there will always be some around who insist on clinging to this or that economic theory rather than doing what works in practice.
Those who want to cut government spending during times of high unemployment, and I daresay some even what to go back to the gold standard -- a ridiculous impossibility-- really haven't a clue. They don't realize that cutting government spending in a recession makes the recession worse, and they certainly do not understand that the U.S. did not choose to go off the gold standard, it was forced to do so because it became impossible for the U.S. Central bank to continue to control the price of gold. Keynes foresaw these difficulties, and realized that selecting a single currency as the reserve currency based on a gold standard would eventually become unsustainable. That is, of course, what happened.