From the article:
Not so great. At the start of the year 2000, prices for gold and silver in real terms were about the same as they were one hundred years before (see charts). Demand (largely from industry) has increased, but supply has on average kept up.
Gold and silver are money, not an investment. Anyone pretending that they are an investment is a shill or a speculator. Anyone pretending they aren't money is ignoring history.
That gold money declined about 13% in the last 3 weeks. Do you consider that a store of value?