The conclusion you should draw is that while gold might protect against inflation in the very long run, 10 years or even 20 years is not the long run. Claude Erb and Campbell Harvey, authors of the 2015 study “
The Golden Constant,” examined the historical evidence on gold as an inflation hedge and concluded: “While gold might protect against inflation in the very long run, 10 years is not the long run. In the shorter run, gold is a volatile investment which is capable and likely to overshoot or undershoot any notion of fair value.”